Q: What is the solution?
Solve 12 = -13*u + 7*u for u.

A: -2

Q: What is the solution?
Solve 1193*a + 5223 + 742 = 0 for a.

A: -5

Q: What is the solution?
Solve 0*x + 61*x - 35319 = 640*x for x.

A:
-61