Помогите пожалуйста решить пример. [latex]{2x - 5 \geq 4 - x {7 - 3x \ \textless \ 12 + x[/latex]

[latex] \left \{ {{2x-5\geq4-x,} \atop {7-3x\textless12+x;}} \right. \left \{ {{2x+x\geq4+5,} \atop {-3x-x\textless12-7;}} \right. \left \{ {{3x\geq9,} \atop {-4x\textless5;}} \right. \left \{ {{x\geq9:3,} \atop {x\ \textgreater \ 5:(-4);}} \right. \left \{ {{x\geq3,} \atop {x\ \textgreater \ -1,25;}} \right. \\ x \geq 3, \\ x\in[3;+\infty)[/latex]