Упростите выражение.
[tex] ( \frac{3}{x+2}- \frac{1}{x+2} - \frac{12}{4- x^{2} } ) : \frac{x+7}{x-2} [/tex]
[tex] ( \frac{3}{x+2}- \frac{1}{x+2} - \frac{12}{4- x^{2} } ) : \frac{x+7}{x-2} [/tex]
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