Question

What solution of the inequality -1<4+5x<9

Answer 1

$-1\ \textless \ 4+5x\ \textless \ 9 \\ \\ -1 - 4 \ \textless \ 5x \ \textless \ 9 - 4 \ / \ subtract \ 4 \ from \ equation \\ \\ -5 \ \textless \ 5x \ \textless \ 5 \ / \ simplify \\ \\ - \frac{5}{5} \ \textless \ x \ \textless \ 1 \ / \ divide \ equation \ by \ 5 \\ \\ -1 \ \textless \ x \ \textless \ 1 \ / \ simplify$

Answer: -1 < x < 1