Solve -57*r - 54*r = -768 - 9 for r.
Solve this plz.

A: 7

Solve 7773*w = 3932*w + 3904*w - 1890 for w.
Solve this plz.

A: 30

Solve -52668 = -755*s - 760*s + 261*s for s.
Solve this plz.

A:
42