Question:
Solve 63*x = -65*x + 119*x + 171 for x..

Answer:
19

Question:
Solve -8 - 8 = 4*d for d..

Answer:
-4

Question:
Solve -9035*s = -9045*s + 440 for s..

Answer:
44

Question:
Solve 4572*a = 4596*a + 528 for a..

Answer:
-22