Q: Solve:
Solve 0 = 2*r - 3789 + 3799 for r.

A: -5

Q: Solve:
Solve 32*f - 47*f - 75 = 0 for f.

A: -5

Q: Solve:
Solve 520 = 53705*l - 53731*l for l.

A:
-20