4+3(10х+7)=-5 5+10(-10х-9)=-3 -7-2(5х-6)=-2
4+30х+21=-5 5-100х-90=-3 -7-10х+12=-2
30х=-4-21-5 -100х=-5+90-3 -10х=7-12-2
30х=-30 -100х=82 -10х=-7
х=-1 х=-0.82 х=0.7
4+5(-3х+7)=-9 -7+2(7х-2)=10 -2=-9-2(-2х+1)
4-15х+35=-9 -7+14х-4=10 -2=-9+4х-2
-15х=-4-35-9 14х=7+4+10 -2+9+2=4х
-15х=-48 14х=21; х=1.5 9=4х; х=2.25
х=3.2