Q: What is the solution?
Solve 15*d = -5*d - 4*d for d.

A: 0

Q: What is the solution?
Solve -1376*o - 32 = -1369*o + 10 for o.

A: -6

Q: What is the solution?
Solve 9486*z = 9447*z - 351 for z.

A:
-9