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x(3x+2)(x-5) + (5x+7)(x-5) - 5(x-5)
Factorizando (x-5), se tiene:
(x-5) ( 3x²+2x+5x+7-5)
(x-5) ( 3x²+7x+2)
(x-5) (3x+1)(x+2)