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6y+10x/xy=4
6y+10x=4xy
18/x+5/y=5
18y+5x/xy=5
18y+5x=5xy
(3(6y+10x)=4xy)-(18y+5x=5xy)
30x-5x=-xy
(25x=-xy)/x
25=-y
y=-25
6y+10x=4xy
6(-25)+10x=4x(-25)
-150+10x=-100x
110x=150
x=15/11