if 5/x-3/y=9 and 3/x-5/y=7then 1/x-1/y=?
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5÷x-3÷y=9
1÷x=9+3÷y
x=1÷9×y+3÷y
x=y÷9y+3
1÷x-1÷y
=1÷y÷9y+3-1÷y
=9y+2÷y
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