Question

Пожалуйста решите 3 пример по математике

Answer 1

3)
$-2\ \textless \ \frac{8+x}{7} \ \textless \ 4 \\\\ -14\ \textless \ 8+x \ \textless \ 28 \\\\ -22\ \textless \ x \ \textless \ 20 \\\\ x\in(-22;20)$

4)
$-7 \ \textless \ \frac{2x+1}{2} \ \textless \ 2 \\\\ -14 \ \textless \ 2x+1\ \textless \ 4 \\\\ -15 \ \textless \ 2x \ \textless \ 3 \\\\ -7.5\ \textless \ x\ \textless \ 1.5 \\\\ x\in(-7.5;1.5)$