Q: Solve:
Solve 0 = -121*l + 114*l + 36 - 15 for l.

A: 3

Q: Solve:
Solve 145*n = -184*n + 299*n - 1200 for n.

A: -40

Q: Solve:
Solve 15 + 1 = 8*f for f.

A:
2