Решите двойное неравенство

3)
$3\ \textless \ 7-4x\ \textless \ 15$
$3-7\ \textless \ 7-4x-7\ \textless \ 15-7$
$-4\ \textless \ -4x\ \textless \ 8$
$-2\ \textless \ x\ \textless \ 1$

4)
$-12\ \textless \ 2(x+3)\ \textless \ 4$
$\frac{-12}{2}\ \textless \ \frac{2(x+3)}{2}\ \textless \ \frac{4}{2}$
$-6\ \textless \ x+3\ \textless \ 2$
$-6-3\ \textless \ x+3-3\ \textless \ 2-3$
$-9\ \textless \ x\ \textless \ -1$