Solve -256*r - 1469 + 1977 = -4100 for r.
Solve this plz.

A: 18

Solve -5*i + 18 + 22 + 5 = 0 for i.
Solve this plz.

A: 9

Solve -14*a - 37*a - 1066 = 31*a for a.
Solve this plz.

A:
-13