3/x-2/y=18 (*2) <=> 6/x-4/y=36
6/x-4/y=36 + 5/x+4/y=8 <=> 11/x=44
11=44x
x= 1/4
3/1/4 - 2/y =18
12-2/y = 18
-2/y= 6
y = -1/3
(x-y) = 1/4 + 1/3
hasilnya, 7/12
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3/x-2/y=18 (*2) <=> 6/x-4/y=36
6/x-4/y=36 + 5/x+4/y=8 <=> 11/x=44
11=44x
x= 1/4
3/1/4 - 2/y =18
12-2/y = 18
-2/y= 6
y = -1/3
(x-y) = 1/4 + 1/3
hasilnya, 7/12