Question: What is the solution?

Solve -1234 = 90*x - 1684 for x.

Answer: 5

Question: What is the solution?

Solve 255 = 113*c - 84 for c.

Answer: 3

Question: What is the solution?

Solve 54 + 52 = 5*b - 43 + 154 for b.

Answer: -1

Question: What is the solution?

Solve -72 = -53*o + 49*o - 76 for o.

Answer:
-1