Question: What is the solution?

Solve 0 = 7*f + 4*f + 55 for f.

Answer: -5

Question: What is the solution?

Solve 14*x + 17*x + 62 = 0 for x.

Answer: -2

Question: What is the solution?

Solve 198*i - 72 = 180*i for i.

Answer: 4

Question: What is the solution?

Solve 3 = 10*s - 57 for s.

Answer:
6