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    Does anybody know how to solve this rational expression?

    ( x^2( x + 3 )( x^2 - 9 ) + 2x( x - 3 )^2 ( x + 3) )/ x^2 + 2x - 3 The book says that it reduces to x( x - 3 )( x + 6 ) , but I don't know how.
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