Q: Solve:
Solve -5131 = 621*k - 126*k + 3284 for k.

A: -17

Q: Solve:
Solve -3550*r - 82893 - 302007 = 299*r for r.

A: -100

Q: Solve:
Solve -48 - 15 = -5*i + 8*i for i.

A:
-21