Question: What is the solution?

Solve 28*s + 11*s = 195 for s.

Answer: 5

Question: What is the solution?

Solve 58*f - 47*f - 43*f - 992 = 0 for f.

Answer: -31

Question: What is the solution?

Solve 0 = 8*c + 20*c - 1328 + 1832 for c.

Answer: -18

Question: What is the solution?

Solve 77*f + 74*f - 313 + 6761 = 47*f for f.

Answer:
-62