Solve 2*o - 77 = -75 for o.
Solve this plz.

A: 1

Solve 50*s - 1075 + 829 = -15*s - 3171 for s.
Solve this plz.

A: -45

Solve -1143 - 672 = 68*c + 97*c for c.
Solve this plz.

A:
-11