1)3х+8х=х
11х=х
11х-х=0
10х=0
х=0
2)5х=180-5х
5х+5х=180
10х=180
х=18
3)5х-2=3х+2
5х-3х=2+2
2х=4
х=2
4)5-2х+4х=21
5+2х=21
2х=21-5
2х=16
х=8
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Answers & Comments
1)3х+8х=х
11х=х
11х-х=0
10х=0
х=0
2)5х=180-5х
5х+5х=180
10х=180
х=18
3)5х-2=3х+2
5х-3х=2+2
2х=4
х=2
4)5-2х+4х=21
5+2х=21
2х=21-5
2х=16
х=8
3х-х=-8
2х=-8
х=-8:2
х=-4
5х=180-5х
5х+5х=180
10х=180
х=180:10
х=18
5х-2=3х+2
5х-3х=2+2
2х=4
х=4:2
х=2
5-2х+4х=21
-2х+4х=21-5
2х=16
х=16:2
х=8