Q: What is the solution?
Solve 431 + 86 - 1086 = 42*r + 1657 for r.

A: -53

Q: What is the solution?
Solve -33*n + 5*n - 110 = -18*n for n.

A: -11

Q: What is the solution?
Solve 4*i = 2*i - 10 for i.

A:
-5