Q: What is the solution?
Solve 0 = -2*u + 19 - 13 for u.

A: 3

Q: What is the solution?
Solve -23*y - 940 = -70*y for y.

A: 20

Q: What is the solution?
Solve -49*z = -97*z - 624 for z.

A:
-13