Question:
Solve 237*v = 238*v - 3 for v..

Answer:
3

Question:
Solve 12743*u = 12727*u for u..

Answer:
0

Question:
Solve 12*d - 7*d - 38*d = 17*d + 2450 for d..

Answer:
-49

Question:
Solve h - 12 = 4*h for h..

Answer:
-4