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Subtract and simplify. `9/( x-4)-7/( x+4)`
`64/(x^2-16)`
`(2 x+64)/(x^2-16)`
`(2 x-64)/(x^2-16)`
`64/( x-4)`
`(64 x+ 2)/(x^2-16)`
Box 1:
Select the best answer
`(2 x+64)/(x^2-16)`
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