-7=5(х+5) 9=5(х+9) 7(х-1)=3х 9(х+7)=-х 5(х-3)=4х 4(х+6)=х -х=4(6+х) 7(-3+2х)=-6х+2
-7 = 5(х+5) -7 = 5х+25 -5х = 25+7 -5х = 32 х = 32:5 х = 6.4