Question

ОЧЕНЬ СРОЧНО, ДАЮ ВСЕ ЗВЕЗДЫ

Answer 1

$\displaystyle\bf\\\left \{ {{3(4x-5)-4(7-3y)=-19} \atop {5(6y-4)-(5+7x)=-2}} \right. \\\\\\\left \{ {{12x-15-28+12y=-19} \atop {30y-20-5-7x=-2}} \right. \\\\\\\left \{ {{12x+12y=-19+15+28} \atop {-7x+30y=-2+20+5}} \right. \\\\\\\left \{ {{12x+12y=24} \atop {-7x+30y=23}} \right. \\\\\\\left \{ {{x+y=2 \ |\cdot 7} \atop {-7x+30y=23}} \right. \\\\\\+\left \{ {{7x+7y=14} \atop {-7x+30y=23}} \right. \\----------\\37y=37\\\\y=1\\\\x=2-y=2-1=1\\\\Otvet \ : \ (1 \ ; \ 1)$