(5x+7)(8-x) больше 0 Решите срочно

Задание решено......

[latex] \left \{ {{5x+7\ \textgreater \ 0} \atop {8-x\ \textgreater \ 0}} \right. ==\ \textgreater \ \left \{ {{x\ \textgreater \ -7/5} \atop {x\ \textless \ 8}} \right. \\ \left \{ {5x+7\ \textless \ 0} \atop {8-x\ \textless \ 0}} \right. ==\ \textgreater \ \left \{ {{x\ \textless \ -7/5} \atop {x\ \textgreater \ 8}} \right. [/latex] x∈(-7/5;8)