Question: What is the solution?

Solve -487 + 2759 = -576*j - 12056 + 1080 for j.

Answer: -23

Question: What is the solution?

Solve -124*k + 743 + 885 = -272*k for k.

Answer: -11

Question: What is the solution?

Solve -641*r + 261*r + 290*r - 450 = 0 for r.

Answer: -5

Question: What is the solution?

Solve 167*f + 5014 + 31 = -4902 + 929 for f.

Answer:
-54