Q: Solve 7*m + 172 = 130 for m.

A: -6

Q: Solve -79*s + 151*s - 135 = 87*s for s.

A: -9

Q: Solve -6*u + 1572 = -74*u - 63*u for u.

A: -12

Q: Solve 51*d - 1950 + 1899 = 0 for d.

A:
1