Q: What is the solution?
Solve -10*a + 0*a + 30 = 0 for a.

A: 3

Q: What is the solution?
Solve -5*f = 17*f - 37*f + 75 for f.

A: 5

Q: What is the solution?
Solve -4110 = 7*m - 111*m + 280*m + 98*m for m.

A:
-15