Q: What is the solution?
Solve 38*r - 783 = -441 for r.

A: 9

Q: What is the solution?
Solve 376*f = 119*f - 142*f + 2490 - 7677 for f.

A: -13

Q: What is the solution?
Solve -33*b = 40*b - 103*b + 600 for b.

A:
20