Система y-x=-5 x+y=37

$\left \{ {{y-x=-5} \atop {x+y=37}} \right. \left \{ {{y=-5+x} \atop {x+(-5+x)=37}} \right. \left \{ {{y=-5+x} \atop {x-5+x=37}} \right. \left \{ {{y=-5+x} \atop {2x=37+5}} \right. \left \{ {{y=-5+x} \atop {2x=42}} \right. \left \{ {{y=-5+x} \atop {x=42:2=21}} \right.$ $\left \{ {{y=-5+21} \atop {x=21}} \right. \left \{ {{y=16} \atop {x=21}} \right.$
ответ: (21; 16)