Помогите решить функцию

Решите задачу:

$\left \{ {{2x+y=1} \atop { \frac{x-2}{3}+ \frac{y}{4} =-1 |*12 }} \right. \\ \left \{ {{2x+y=1|*-2} \atop { 4x-8+3y =-12 }} \right. \\ \left +\{ {{-4x-2y=-2} \atop { 4x-8+3y =-12 }} \right. \\ \left \{ {{y-8=-14} \atop {2x+y=1}} \right. \\ \left \{ {{y=-6} \atop {2x-6=1}} \right. \\ \left \{ {{y=-6} \atop {2x=7}} \right. \\ \left \{ {{y=-6} \atop {x=3 \frac{1}{2} }} \right.$