Respuesta :

(7x+2+8x^4)-(2x-5-8x^4)+(3x+5x^4)
(5x+7+16x^4) + (3x+5x^4)
8x + 7 + 21x^4

(7x+2+8x^4)

-2x+5+8x^4

(5x+7+16x^4)+(3x+5x^4)

=8x+7+21x^4

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