Question:
Solve -28*v = -29*v - 6 for v..

Answer:
-6

Question:
Solve 0 = 21*a - 58 - 47 for a..

Answer:
5

Question:
Solve f + 52 - 51 = 0 for f..

Answer:
-1

Question:
Solve -15629 = -630*w - 10022 - 71127 for w..

Answer:
-104