solve: x + y= 5 and 1/x -1/y=3/5
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x=5-y
1/x-1/y=3/5
y-x/xy =3/5
y-x=3/5×xy
y-5+y=3/5×xy
-25/3= xy
y-x/xy =3/5
y-x=3/5×-25/3
y-x=-5 is equation 2
x+y=5
-x+y=-5
add above equations
then y=0 ,
then x= 5,
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