Q: Solve -2*u = -6*u + 16 for u.

A: 4

Q: Solve 0 = 42*q + 424 - 46 for q.

A: -9

Q: Solve -584*c - 1271*c = -1855 for c.

A: 1

Q: Solve 0 = -7*c - 2*c - 81 for c.

A:
-9