Q: Solve:
Solve -33*k - 440 + 21 - 208 = 0 for k.

A: -19

Q: Solve:
Solve 10 = 5*f - 0*f for f.

A: 2

Q: Solve:
Solve -8*r - 9*r = 4*r - 483 for r.

A:
23