Помогите 1 уравнение

[latex] \left \{ {{x-1\ \textless \ 2+3x} \atop {5x-y\ \textless \ x+9}} \right. [/latex] [latex] \left \{ {{3x-x\ \textgreater \ -1-2} \atop {5x-x\ \textless \ 9+7}} \right. [/latex] [latex] \left \{ {{2x\ \textgreater \ -3} \atop {4x\ \textless \ 16}} \right. [/latex] [latex] \left \{ {{x\ \textgreater \ -1,5} \atop {x\ \textless \ 4}} \right. [/latex] Ответ: x∈(-1,5; 4)