1) 7х-(3+2х)=х+9
7х-3-2х=х+9
7х-2х-х=9+3
4х=12
х=12:4
х=3
2) 13-(2х-5)=х-3
13-2х+5=х-3
-2х-х= -3-13-5
-3х= -21
х= -21:(-3)
х=7
3) 3х-(10-9х)=22х
3х-10+9х=22х
3х+9х-22х=10
-10х=10
х=10:(-10)
х= -1
4) 26-(17-2х)=5х
26-17+2х=5х
9+2х=5х
2х-5х= -9
-3х= -9
х= -9:(-3)
х=3