Решение систем неравинств с одной переменной

$\left \{ {{72x-144\ \textless \ 9(10x-8)} \atop {7(2x-3)\ \textgreater \ 21x-63}} \right. \\ \left \{ {{72x-144\ \textless \ 90x-72} \atop {14x-21\ \textgreater \ 21x-63}} \right. \\ \left \{ {{-18x\ \textless \ 72} \atop {-7x\ \textgreater \ -42}} \right. \\ \left \{ {{x\ \textgreater \ -4} \atop {x\ \textless \ 6}} \right. \\ -4\ \textless \ x\ \textless \ 6$
Ответ: (-4;6).