x-y=12and 1/x-1/y=3. How much is x*y Possibly answers -6,6,-4,4

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Given that x-y = 12 and 1/x -1/y = 3, we are to find x*y.

=> 1/x -1/y = 3

=> [xy/1] [1/x -1/y] = 12

=> (y - x) /xy = 3

=>  3xy = y - x

=>  -3xy = x - y

=>  -3xy...

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