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Math·Advanced Math·Equivalent expressions

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Which of the following is equivalent to $\frac{3x^2+7x-6}{9-x^2}$ for $x\ne -3$ and $x\ne 3$?

A

$-3+\frac{7}{3-x}$

B

$3-\frac{7}{3-x}$

C

$-3+\frac{7}{3+x}$

D

$3-\frac{7}{3+x}$