Q: What is the solution?
Solve 284 = -28*r - 277 + 650 - 285 for r.

A: -7

Q: What is the solution?
Solve -33 = -5*l - 8 for l.

A: 5

Q: What is the solution?
Solve 972*r + 387*r + 38458 = -28133 for r.

A:
-49