Question: What is the solution?

Solve -13*b + 76 = -51*b for b.

Answer: -2

Question: What is the solution?

Solve 293*r - 3018 + 1295 = 6481 for r.

Answer: 28

Question: What is the solution?

Solve -435*z - 10132 + 10598 = 241*z + 87670 for z.

Answer: -129

Question: What is the solution?

Solve -454*o - 17015 + 6604 = -262*o + 15125 for o.

Answer:
-133