5x-6+x=2(x-1) и еше -(9-2b)-(b+5)=16
Ой 5x-6+x=2(x-1)
5х-6+х=2х-2 6х-2х=-2+6 3х=4 х=4/3 х=1цел 1/3 -9+2б-б-5=16 б=16+9+5=30