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Hola tengo un problema con el boton de signo "=" es el que da el resultado

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eh intentado de diversas maneras y no que funciona

Código Delphi [-]
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    Button7: TButton;
    Button8: TButton;
    Button9: TButton;
    Button10: TButton;
    Button11: TButton;
    Edit1: TEdit;
    Button12: TButton;
    Button13: TButton;
    Button14: TButton;
    Button15: TButton;
    Button16: TButton;
    Button17: TButton;
    procedure Button14Click(Sender: TObject);
    procedure Button11Click(Sender: TObject);
    procedure Button12Click(Sender: TObject);
    procedure Button13Click(Sender: TObject);
    procedure Button15Click(Sender: TObject);
    procedure Button17Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button10Click(Sender: TObject);
    procedure Button8Click(Sender: TObject);
    procedure Button9Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button14Click(Sender: TObject);
begin
edit1.Text := edit1.Text + button14.caption
end;

procedure TForm1.Button11Click(Sender: TObject);
begin
edit1.Clear;
end;

procedure TForm1.Button12Click(Sender: TObject);
begin
edit1.Text := edit1.Text + button12.caption;
end;

procedure TForm1.Button13Click(Sender: TObject);
begin
edit1.Text := edit1.Text + button13.caption;
end;

procedure TForm1.Button15Click(Sender: TObject);
begin
edit1.Text := edit1.Text + button15.caption;
end;

procedure TForm1.Button17Click(Sender: TObject);
begin
edit1.Text := edit1.Text + button17.caption;
end;

procedure TForm1.Button7Click(Sender: TObject);
var
  cero: integer;
begin
  cero := 0;
  edit1.text := edit1.text + inttostr(cero);
end;

procedure TForm1.Button6Click(Sender: TObject);
var
  cero: integer;
begin
  cero := 1;
  edit1.text := edit1.text + inttostr(cero);
end;

procedure TForm1.Button5Click(Sender: TObject);
var
  dos: integer;
begin
  dos := 2;
  edit1.text := edit1.text + inttostr(dos);
end;

procedure TForm1.Button4Click(Sender: TObject);
var
  tres: integer;
begin
  tres := 3;
  edit1.text := edit1.text + inttostr(tres);
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  cuatro: integer;
begin
  cuatro := 4;
  edit1.text := edit1.text + inttostr(cuatro);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  cinco: integer;
begin
  cinco := 5;
  edit1.text := edit1.text + inttostr(cinco);
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  seis: integer;
begin
  seis := 6;
  edit1.text := edit1.text + inttostr(seis);
end;

procedure TForm1.Button10Click(Sender: TObject);
var
  siete: integer;
begin
  siete := 7;
  edit1.text := edit1.text + inttostr(siete);
end;

procedure TForm1.Button8Click(Sender: TObject);
var
  ocho: integer;
begin
  ocho := 8;
  edit1.text := edit1.text + inttostr(ocho);
end;

procedure TForm1.Button9Click(Sender: TObject);
var
  nueve: integer;
begin
  nueve := 9;
  edit1.text := edit1.text + inttostr(nueve);
end;

end.

aca esta la aplicacion solo le falta el boton = que es el que da el resultado final

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