Q: Solve -21*s + 36 + 6 = 0 for s.

A: 2

Q: Solve -83*x + 116 = -184 - 115 for x.

A: 5

Q: Solve -4*w = -3*w for w.

A: 0

Q: Solve -136778*r = -137101*r - 24871 for r.

A:
-77