Question:
Solve -4*a + 8 + 0 = -8 for a..

Answer:
4

Question:
Solve -6816 = 711*l + 13803 for l..

Answer:
-29

Question:
Solve 113637 + 10727 + 6086 = -2609*v for v..

Answer:
-50

Question:
Solve -7 = 9*f - 16*f for f..

Answer:
1