Question: What is the solution?

Solve -18*x + 51*x + 231 = 0 for x.

Answer: -7

Question: What is the solution?

Solve -586 + 450 = -91*x + 865 for x.

Answer: 11

Question: What is the solution?

Solve -30*s - 10913 = -11633 for s.

Answer: 24

Question: What is the solution?

Solve 10212 + 18414 = 1101*u for u.

Answer:
26