Question

-s/7-4+3f use s=14 and f=-8 (Last one I swear, I'm sorryxD)

Answer 1

-s/7-4+3f
Replace s with 14 and f with -8.
-14/7-4+3(-8)
Follow the order of operations: do multiplication and division first, then addition and subtraction.
-2-4-24
Solve:
=-30.
The answer is -30.