Question:
Solve 4*w = -6*w - 40 for w..

Answer:
-4

Question:
Solve 106 - 56 - 56 = 3*k for k..

Answer:
-2

Question:
Solve 12 = -10*b - 28 for b..

Answer:
-4

Question:
Solve 1143 + 4113 = 292*v for v..

Answer:
18