Q: Solve:
Solve 139*u - 194*u - 1375 = 220*u for u.

A: -5

Q: Solve:
Solve -2*c + 4*c = 2 for c.

A: 1

Q: Solve:
Solve 215*k + 66*k + 3811 = 178*k for k.

A:
-37