1)7х-(3х+2х)=х+9
2) 13-(2х-5)=х-3
3) 3х-(10-9х)=22х
4) 26-(17-2х)=5х

1)7х-(3х+2х)=х+97х-3х-2х=х+92х=х+92х-х=9х=92) 13-(2х-5)=х-313-2х+5=х-3-2х-х=-3-13-5-3х=-21х=73) 3х-(10-9х)=22х3х-10+9х=22х12х-10=22х22х-12х=-1010х=-10х=-14) 26-(17-2х)=5х26-17+2х=5х5х-2х=93х=9х=3

4) 26-(17-2х)=5х 26-17+2х=5х2х-5х=9-3х=9х=-3