Вариант 1.
a := 2;b := -a - 5;
a := -2;b := a + 2*5;
a := 5;b := 9;b := a + b;c := a + b;
a := 2;b := 6;a := a - b;b := 2*b - a;
a := 35;
a := 22;b := 4;b := a div b + b;c := a mod b + a;
a := 26;b := 6;c := a mod b + b;