Question: What is the solution?

Solve -9 - 9 = -18*f for f.

Answer: 1

Question: What is the solution?

Solve -652*z - 29149 = 31206 - 10803 for z.

Answer: -76

Question: What is the solution?

Solve 0 = -86*z - 85*z + 684 for z.

Answer: 4

Question: What is the solution?

Solve 0 = -1316*s + 1416*s - 100 for s.

Answer:
1