Q: What is the solution?
Solve -289*r = -89*r + 159*r - 4308 for r.

A: 12

Q: What is the solution?
Solve -20*d - 533 = -51*d - 10*d for d.

A: 13

Q: What is the solution?
Solve -79*n - 1547 = -94*n - 104*n for n.

A:
13