4х-24=х-9
4х-х=24-9
3х=15
х=5
6-3х-3=7-2х
-3х+2х=7-6+3
-х=4
х=-4
8х+3-10х-6=9
-2х=9+6-3
-2х=12
х=12:(-2)
х=-6
3.5-х=8х+22.4
-х-8х=22.4-3.5
-9х=18.9
х=-2.1
1.8-0.6у=4.5-0.7у-6.3
-0.6у+0.7у=4.5-6.3-1.8
0.1у=-3.6
у=-36
3/5(7/9х-1/3)=х-2 1/3
7/15х-1/5=х-2 1/3
7/15х-х=2 1\3+1/5
-8/15х=2 8/15
х=38/15:(-8/15)
х=-4 3/4