-4(3+х)=9
-12-4х=9
-4х=9+12
-4х=21
х=-21/4
х=-5,25
3(2-5х)=8х
6-15х=8х
-15х-8х=-6
-23х=-6
х=6/23
5(8+2х)=10-4х
40+10х=10-4х
10х+4х=10-40
14х=-30
х=-30/14
2(4х)=4(х+5)
8х=4х+20
8х-4х=20
4х=20
х=20/4
х=5
-4(3+х)=9
-12-4х=9
-4х=9+12
-4х=21
х=-21/4
х=-5,25
3(2-5х)=8х
6-15х=8х
-15х-8х=-6
-23х=-6
х=6/23
5(8+2х)=10-4х
40+10х=10-4х
10х+4х=10-40
14х=-30
х=-30/14
2(4х)=4(х+5)
8х=4х+20
8х-4х=20
4х=20
х=20/4
х=5