Q: Solve:
Solve -7*n - 13 = 8 for n.

A: -3

Q: Solve:
Solve -1920 = 138*h + 67*h - 13*h for h.

A: -10

Q: Solve:
Solve -136*f + 40*f = 42*f - 2760 for f.

A:
20