Question

how do you solve -8 < 5x + 7 < 12

Answer 1

u need to isolate x here.
so first, from 5x+7, we need to remove 7. so subtract 7 all throughout.

Answer 2

so u'll get,
-8-7 < 5x + 7 - 7 < 12 - 7
= -15 < 5x < 5
now u still have 5 in 5x. try isolating it.