Q: Solve:
Solve 15 = 69*f + 429 for f.

A: -6

Q: Solve:
Solve 646*v + 454*v = -457*v - 263*v + 83720 for v.

A: 46

Q: Solve:
Solve 457*i - 526*i = -2553 for i.

A:
37