6-3(х+1)=7-х 6-3х-3=7-х -3х+х=7-6+3 -2х=4 х=4-2) х=-2 2.8-х=8(х+2.8) 2.8-х=8х+22.4 -х-8х=22.4-2.8 -9х=19.6 х=-2.18