Q: What is the solution?
Solve 420*x + 367*x - 107636 = -729*x for x.

A: 71

Q: What is the solution?
Solve 0 = 62*d - 67*d - 15 for d.

A: -3

Q: What is the solution?
Solve 145 + 30 = 25*d for d.

A:
7