Question:
Solve 0 = -957671*r + 957657*r - 392 for r..

Answer:
-28

Question:
Solve -9292 = 7020*b - 6818*b for b..

Answer:
-46

Question:
Solve -1723*d = 1877*d + 284400 for d..

Answer:
-79

Question:
Solve r - 510 + 495 = -4*r for r..

Answer:
3