Q: Solve -243*r - 25 = -268*r for r.

A: 1

Q: Solve 16*b + 99 = 137 + 234 for b.

A: 17

Q: Solve -61 = -89*x + 28 for x.

A: 1

Q: Solve 137*d + 28 = -1429 - 872 for d.

A:
-17