Question: What is the solution?

Solve 149 - 139 = 10*f for f.

Answer: 1

Question: What is the solution?

Solve -1624 = 21*z + 10*z + 85*z for z.

Answer: -14

Question: What is the solution?

Solve -43632*j - 136 = -43615*j for j.

Answer: -8

Question: What is the solution?

Solve -28 + 32 = -z for z.

Answer:
-4