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=171+21

16у=192

у=12

4(х-9)=3(х-8)

4х-36=3х-24

4х-3х=36-24

х=12

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

21-15=14х-15х

6=-х

х=-6