Solve 15 = 11*r - 14*r for r.
Solve this plz.

A: -5

Solve 23*y - 330*y + 712 = 1940 for y.
Solve this plz.

A: -4

Solve -21283*i = -21300*i - 204 for i.
Solve this plz.

A:
-12