5 x + 3 ( - 1 - x) = - 8 x - 8 5х-3-3х=-8х-8 2х+8х=-8+3 10х=-5 х=-5:10= - 0,5
5х-3-3х=-8х-8 2х+8х=-8+3 10х=-5 х=-2 просто...