Question:
Solve 6 + 50 = -8*f for f..

Answer:
-7

Question:
Solve -150*s - 559 + 49 - 90 = 0 for s..

Answer:
-4

Question:
Solve 6*q + 168 = 138 for q..

Answer:
-5

Question:
Solve 0 = 7*z - 55 + 27 for z..

Answer:
4