Question:
Solve -108*v + 100*v = -56 for v..

Answer:
7

Question:
Solve 0 = -6*a - 13 + 31 for a..

Answer:
3

Question:
Solve 7*s + 18 = s for s..

Answer:
-3

Question:
Solve 22*j + 199*j = 453 - 11 for j..

Answer:
2