Q: Solve:
Solve 0 = 12*t - 9*t + 25*t - 420 for t.

A: 15

Q: Solve:
Solve 3375 = -29*f - 106*f for f.

A: -25

Q: Solve:
Solve 3226*j - 1452 = 3182*j for j.

A:
33