Q: What is the solution?
Solve 86*u - 847 - 56 = 129*u for u.

A: -21

Q: What is the solution?
Solve -2893 = 178*l + 85*l for l.

A: -11

Q: What is the solution?
Solve -54*j - 2642 = -5*j - 1177*j - 193*j for j.

A:
2