Q: What is the solution?
Solve -13 = 5*z - 33 for z.

A: 4

Q: What is the solution?
Solve 413*y + 1927*y = 550*y + 16852 + 26108 for y.

A: 24

Q: What is the solution?
Solve 54*r - 19 + 42 = -31 for r.

A:
-1