Пожалуйста помогите!!!! Система уравнений

Решите задачу:

$\left \{ {{-3x\ \textless \ 12\ |\ *\ (-1)} \atop {5x \leq 30}} \right. \\\\ \left \{ {{-3x*(-1)\ \textgreater \ 12*(-1)} \atop {5*x \leq 5*6}} \right. \\\\ \left \{ {{3x\ \textgreater \ -12} \atop {x \leq 6}} \right. \\\\ \left \{ {{3*x\ \textgreater \ 3*(-4)} \atop {x \leq 6}} \right. \\\\ \left \{ {{x\ \textgreater \ -4} \atop {x \leq 6}} \right. \\\\ -4\ \textless \ x \leq 6\\\\ x\in(-4;\ 6]$