Вариант 3.
a := -2;b := a + 2*5;
a := 5;b := 9;b := a + b;c := a + b;
a := 1;b := 5;a := a - b;b := 2*b - a;
a := 2;b := 6;b := a - b;c := b - a;
var a, b: integer;
a := 28;b := 7;b := a mod b + 4;c := a mod b + 1;
a := 22;b := 4;b := a div b;c := a mod (b + 1);