-3х+5(-9+4х)=-х-4
-6х-4 (9-7Х)=-5х+1

-3x+5(-9+4x)=-x-4-3x-45+20x=-x-417x+x=-4+4518x=41x=41:18x=2 5/18-6x-4(9-7x)=-5x+1-6x-36+28x=-5x+122x+5x=1+3627x=37x=37:27x=1 10/27

-3х+5(-9х+4х)=-х-4-3х-45+20х=-х-4-3х+20х+х=-4+4518х=41х=41/18=2 5/18-6х-4(9-7х)=-5х+1-6х-36+28х=-5х+1-6х+28х+5х=3727х=37х=37/27=1 10/27