Question:
Solve 251*j = -48*j - 138*j + 20976 for j..

Answer:
48

Question:
Solve 1043*x + 441*x - 53424 = 0 for x..

Answer:
36

Question:
Solve 869*u - 687*u = -6916 for u..

Answer:
-38

Question:
Solve 0 = -28*d + 19*d + 72 for d..

Answer:
8