[tex]\left \{ {{3(x+2)-2y=2} \atop {3x+4(7-y)=10}} \right.<=>\left \{ {{3x+6-2y=2} \atop {3x+28-4y=10}} \right.<=>\left \{ {3x-2y=-4}} \atop {3x-4y=-18}} \right."-"\\ -2y+4y=-4+18<=>2y=14|:2=>y=7\\3x-2y=-4<=>3x-2*7=-4<=>3x-14=-4<=>3x=10=>x=\frac{10}{3}\\ \left \{ {{y=7} \atop {x=\frac{10}{3}}} \right.[/tex]
