Question:
Solve 504*d - 3585 = 6495 for d..

Answer:
20

Question:
Solve 142*f + 633 = -786 - 285 for f..

Answer:
-12

Question:
Solve 21*z = 25*z for z..

Answer:
0

Question:
Solve 409125 = -15552*i + 10097*i for i..

Answer:
-75