Solve -63 = 69*t - 57*t + 57 for t.
Solve this plz.

A: -10

Solve -64*s + 173*s + 90 = 67*s + 57*s for s.
Solve this plz.

A: 6

Solve -5*c = -5 - 30 for c.
Solve this plz.

A:
7