Q: Solve:
Solve -342*c + 148*c - 391*c = -31910 + 7340 for c.

A: 42

Q: Solve:
Solve 6*a + 2*a = 2*a for a.

A: 0

Q: Solve:
Solve -58*m + 538*m = 0 for m.

A:
0