Question: What is the solution?

Solve 626*f + 3329 = -171 - 256 for f.

Answer: -6

Question: What is the solution?

Solve -391 + 1342 = 165*b - 5449 - 2015 for b.

Answer: 51

Question: What is the solution?

Solve -20 = 5*z - 10 for z.

Answer: -2

Question: What is the solution?

Solve 653 = -19*k + 83 for k.

Answer:
-30