Q: Solve:
Solve -45 + 2402 = 23*r + 15*r + 457 for r.

A: 50

Q: Solve:
Solve 1082*x - 5868 = 919*x for x.

A: 36

Q: Solve:
Solve 6*z - 12 = 12 for z.

A:
4