Q: Solve:
Solve 159 - 1284 = 225*u for u.

A: -5

Q: Solve:
Solve -140*p - 672*p + 4956 + 5941 = 2777 for p.

A: 10

Q: Solve:
Solve -5*l - 2 - 23 = 0 for l.

A:
-5