Q: Solve -122429 = -103*r - 118412 for r.

A: 39

Q: Solve -30*q - 7028 + 10655 = -123*q for q.

A: -39

Q: Solve -2075*a - 6 = -2072*a - 3 for a.

A: -1

Q: Solve 4*b + 35 - 23 = 0 for b.

A:
-3