ПОМОГИТЕ РЕШИТЬ СИСТЕМУ УРАВНЕНИЙ: 2х-3у=5 х+3у=7

$\left \{ {{2x-3y=5} \atop {x+3y=7}} \right.$

$\left \{ {{x=7-3y} \atop {2x-3y=5}} \right.$

$\left \{ {{x=7-3y} \atop {2(7-3y)-3y=5}} \right.$

$\left \{ {{x=7-3y} \atop {14-6y-3y=5}} \right.$

$\left \{ {{x=7-3y} \atop {-9y=-9}} \right.$

$\left \{ {{x=7-3y} \atop {y=1}} \right.$

$\left \{ {{x=7-3} \atop {y=1}} \right.$

$\left \{ {{x=4} \atop {y=1}} \right.$