Question: What is the solution?

Solve -400 = -548*f + 3436 for f.

Answer: 7

Question: What is the solution?

Solve 500*u - 1653*u - 550*u = 2140*u - 65331 for u.

Answer: 17

Question: What is the solution?

Solve -74 = t - 71 for t.

Answer: -3

Question: What is the solution?

Solve 616 = 87*c + 2878 for c.

Answer:
-26