Q: Solve:
Solve -497*r = -400*r + 987*r + 27100 for r.

A: -25

Q: Solve:
Solve 76*s - 5 - 223 = 0 for s.

A: 3

Q: Solve:
Solve 444*r - 317*r + 5593 - 30940 = -370*r for r.

A:
51