3х-1=2(х-2)
3х-1=2х-4
3х-2х=1-4
х= -3
3(х+5)=7-5х
3х+15=7-5х
3х+5х=7 -15
8х= -8
х= -1
19(у-9)=3(у+7)
19у-171=3у+21
19у-3у=21+171
16у=192
у=12
х-9=3(х-8)
х-9=3х-24
3х-х=24-9
2х=15
х=7 1/2
3(2х-9)=5(х-4)
6х-27=5х-20
6х-5х=27-20
х=7
7(3-2х)=15(1-х)
21-14х=15-15х
15х-14х=15-21
х= - 6