Q: What is the solution?
Solve 1570*h = 789*h - 781 for h.

A: -1

Q: What is the solution?
Solve 6*r + 25 = 43 for r.

A: 3

Q: What is the solution?
Solve -107*d + 1401*d + 398*d = -20304 for d.

A:
-12