Question: What is the solution?

Solve -9*u - 12*u = 63 for u.

Answer: -3

Question: What is the solution?

Solve 114*s - 45*s - 138 = 0 for s.

Answer: 2

Question: What is the solution?

Solve -y = -21*y - 60 for y.

Answer: -3

Question: What is the solution?

Solve -816*l + 307*l + 22802 = 68612 for l.

Answer:
-90