Question: What is the solution?

Solve 1588*f - 783*f = 792*f + 78 for f.

Answer: 6

Question: What is the solution?

Solve -31*k - 824 + 211 = 1340 for k.

Answer: -63

Question: What is the solution?

Solve -1260 - 8952 = 204*s + 12980 - 548 for s.

Answer: -111

Question: What is the solution?

Solve -1726*j + 6897 = -2089*j for j.

Answer:
-19