Q: Solve:
Solve 32 = 21*r - 29*r for r.

A: -4

Q: Solve:
Solve -3*k + 307606 - 307597 = 0 for k.

A: 3

Q: Solve:
Solve 0 = 9138432*d - 9138767*d + 25125 for d.

A:
75