Решите систему уравнений способом сложения знак системы -x/3+y/5=2, 5x/9+y/2=-5;

$\left \{ {{ \frac{-x}{3}+ \frac{y}{5} =2} \atop { \frac{5x}{9}+ \frac{y}{2} =-5}} \right. \left \{ {{-5x+3y=30} \atop {10x+9y=-90}} \right. \left \{ {{-10x+6y=30} \atop {10x+9y=-90}} \right. |+ \left \{ {{-5x+3y=30} \atop {15y=-60}} \right. \left \{ {{-5x-12=30} \atop {y=-4}} \right.$
$\left \{ {{-5x-12=30} \atop {y=-4}} \right. \left \{ {{-5x=18} \atop {y=-4}} \right. \left \{ {{x=-3.6} \atop {y=-4}} \right.$
Ответ: $(-3.6;-4)$