-3х+5(-9+4х)=-х-4 -6х-4 (9-7Х)=-5х+1
-3х+5(-9х+4х)=-х-4 -3х-45+20х=-х-4 -3х+20х+х=-4+45 18х=41 х=41/18=2 5/18 -6х-4(9-7х)=-5х+1 -6х-36+28х=-5х+1 -6х+28х+5х=37 27х=37 х=37/27=1 10/27
-3x+5(-9+4x)=-x-4 -3x-45+20x=-x-4 17x+x=-4+45 18x=41 x=41:18 x=2 5/18 -6x-4(9-7x)=-5x+1 -6x-36+28x=-5x+1 22x+5x=1+36 27x=37 x=37:27 x=1 10/27