Q: Solve -2412*x - 1740 = -2499*x for x.

A: 20

Q: Solve -9*s - 5*s = 70 for s.

A: -5

Q: Solve 0 = -257*u + 263*u + 12 for u.

A: -2

Q: Solve 2984*u - 110877 = 99*u - 4285*u + 405363 for u.

A:
72