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2x^2 + 6x + 5x + 15
2x ( x + 3 ) + 5 ( x + 3 )
(2x+5) (x+3)
~ x^2 - 9 = (x+3) (x-3)
(2x + 5) (x+3) / (x-3) (x+3)
= 2x+5 / x-3
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