Verified answer

1) 0,9(у-4)=0,2(7+5у)

0,9у-3,6=1,4+у

0,9у-у=1,4+3,6

-0,1у=5

у=5:(-0,1)

у= -50

2) 2(4,5-4х)=7(2-х)

9-8х=14-7х

-8х+7х=14-9

-х=5

х= -5

3) 3(3х+29/9)=10(х+1)

9х+29/3=10х+10

9х-10х=10-29/3

-х= 30/3-29/3

-х=1/3

х= -1/3