Решите систему уравнений

Решите задачу:

$\left \{ {{ \frac{15x-3y}{4} + \frac{3x+2y}{6} =3\, |\cdot 12} \atop { \frac{3x+y}{3} - \frac{x-3y}{2} =6\, |\cdot 6}} \right. \; \left \{ {{3(15x-3y)+2(3x+2y)=36} \atop {2(3x+y)-3(x-3y)=36}} \right. \\\\ \left \{ {{51x-5y=36} \atop {3x+11y=36}} \right. \; \ominus \; \left \{ {{48x-16y=0} \atop {3x+11y=36}} \right. \; \left \{ {{y=3x} \atop {3x+11\cdot 3x=36}} \right. \; \left \{ {{y=3x} \atop {36x=36}} \right. \\\\ \left \{ {{y=3} \atop {x=1}} \right. \\\\Otvet:\; \; (1,3)\; .$