Question: What is the solution?

Solve 9 = 19*s + 85 for s.

Answer: -4

Question: What is the solution?

Solve 980 = -86*s + 20*s + 31*s for s.

Answer: -28

Question: What is the solution?

Solve 49 = -5*t + 54*t for t.

Answer: 1

Question: What is the solution?

Solve 35*b + 98 = -217 for b.

Answer:
-9