-5(5-х)-4х=18 -25+5х-4х=18 5х-4х=18+25 х=43 1/3(3х-6)-2/7(7х-2)=91 х-2-2х+4/7=91 х-2х=91+2-4/7 -х=93-4/7 -х=92 3/7 х=-92 3/7