Q: What is the solution?
Solve -8*r + 11*r + 9 = 0 for r.

A: -3

Q: What is the solution?
Solve 0 = 6*n + 50 - 20 for n.

A: -5

Q: What is the solution?
Solve 5*d = -10 - 15 for d.

A:
-5