{ 3- ( x-2y) - 4y= 18
{ 2x -3y +3=2 (3x-y}

раскрываем скобки{3-x+2y-4y=18{2x-3y+3=6x-2y{-x-2y=15{-4x-y=-3{x=-15-2y{x=(3-y)/415-2y=(3-y)/460-8y=3-y60-3=-y+8y57=7yy=57/7=x=-15-2y=-15-114/7= (-105-114)/7=-219/7 =-31 2/7