Q: What is the solution?
Solve -390*q + 439 = 1785 + 1384 for q.

A: -7

Q: What is the solution?
Solve 30*r + 13 = 133 for r.

A: 4

Q: What is the solution?
Solve 647*c + 440*c + 296*c = -393*c - 120768 for c.

A:
-68