1) 2-3(2х+5)=5-4х
2-6х-15=5-4х
-6х+4х=5+15-2
-2х=18
х=-9
2)5-2х=11-7(х+2)
5-2х=11-7х-14
-2х+7х=11-14-5
5х=-8
х=-8/5
х=-1,6
4)10х+9=7х
10х-7х=-9
3х=-9
х=-3
5)-х-2+3(х-3)=3(4-х)-3
-х-2+3х-9=12-3х-3
-х+3х+3х=12-3+2+9
5х=20
х=4
3)3х+5+(х+5)=(1-х)+4
3х+5+х+5=1-х+4
3х+х+х=1+4-5-5
5х=-5
х=-1