Question: What is the solution?

Solve -657*s = -23*s + 129*s + 264*s - 63674 for s.

Answer: 62

Question: What is the solution?

Solve 0 = -43*z + 21 + 22 for z.

Answer: 1

Question: What is the solution?

Solve 336*u + 3662 = 3044 - 4086 for u.

Answer: -14

Question: What is the solution?

Solve -7*z - 281 = -246 for z.

Answer:
-5