Question:
Solve 378 = -4985*b + 5012*b for b..

Answer:
14

Question:
Solve -8 + 8 = -4*w for w..

Answer:
0

Question:
Solve 779*i = 819*i + 400 for i..

Answer:
-10

Question:
Solve -5*d + 27 = 47 for d..

Answer:
-4