Question:
Solve 13*f - 5*f - 40 = 0 for f..

Answer:
5

Question:
Solve -3*l - 71 + 56 = 0 for l..

Answer:
-5

Question:
Solve 0 = 703*k - 4871 + 14713 for k..

Answer:
-14

Question:
Solve -8*a + 624 - 816 = 0 for a..

Answer:
-24