Q: Solve:
Solve 158*x = -x - 20*x + 3759 for x.

A: 21

Q: Solve:
Solve -45*y = -113*y + 466*y - 13930 for y.

A: 35

Q: Solve:
Solve 0 = -f + 4 - 6 for f.

A:
-2