17(2-1/3y)-1/5(10-5y)=1
85(2-1/3y)-(10-5y)=5
170-85/3y-10+5y=5
510-85y-30+15y=15
465=70y y=6.64
5(z-4)-7(7-z)-9=12-3(9-z)
5z-20-49+7z-9=12-27+3z
9z=90-27
z=7
17(2-1/3y)-1/5(10-5y)=1
85(2-1/3y)-(10-5y)=5
170-85/3y-10+5y=5
510-85y-30+15y=15
465=70y y=6.64
5(z-4)-7(7-z)-9=12-3(9-z)
5z-20-49+7z-9=12-27+3z
9z=90-27
z=7