Question:
Solve -530 = -15*b + 168*b + 2683 for b..

Answer:
-21

Question:
Solve -24104*j - 845 = -24273*j for j..

Answer:
5

Question:
Solve -150*f + 122 - 243 = 201 + 278 for f..

Answer:
-4

Question:
Solve 37 - 40 = 7*a + 60 for a..

Answer:
-9