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What should be added to 1/((x-2) (x-4)) ...

What should be added to `1/((x-2) (x-4))` to get `(2x-5)/((x^(2) - 5x + 6)(x-4))` ?

A

`1/(x^(2) -7x + 12)`

B

`1/(x^(2) + 7x + 12)`

C

`1/(x^(2) - 7x - 12)`

D

`1/(x^(2) + 7x - 12)`

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