Q: What is the solution?
Solve 31*r = 632*r + 11222 + 2601 for r.

A: -23

Q: What is the solution?
Solve -319*k + 293*k + 598 = 0 for k.

A: 23

Q: What is the solution?
Solve 85*j = -90*j + 160*j + 405 for j.

A:
27