Q: What is the solution?
Solve 844*s = -492*s - 40080 for s.

A: -30

Q: What is the solution?
Solve -26*u - 58*u - 55*u + 139 = 0 for u.

A: 1

Q: What is the solution?
Solve 21*a - 57*a - 54 = -18*a for a.

A:
-3