Solve -7*r + 7*r + 120 = -12*r for r.
Solve this plz.

A: -10

Solve -609 + 1824 = 135*b for b.
Solve this plz.

A: 9

Solve -750*m - 3699 + 23949 = 0 for m.
Solve this plz.

A:
27