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20(y+4)=15*16
20y=15*16/80
20y=3
y=3/20
y-3/6=21/14
(y-3)14=6.21
14y-42=6*21
14y=6.21/42
14y=3
y=3
x/9=12/8
8x=12.9
x=12.9/8
=27/2
=13.5