Question: What is the solution?

Solve 20*s + 20 = -0*s for s.

Answer: -1

Question: What is the solution?

Solve -h + 687 = -14*h + 648 for h.

Answer: -3

Question: What is the solution?

Solve 20*u - 1290 - 1340 = -2410 for u.

Answer: 11

Question: What is the solution?

Solve 142*n - 3309 = -136*n + 27 for n.

Answer:
12