High School

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Simplify:

(7x + 2 + 8x^4) – (2x – 5 – 8x^4) + (3x + 5x^4)

A. 15x^4 + 19x + 7
B. 21x^4 + 8x + 7
C. 21x^4 + 14x + 7
D. 15x^4 + 14x + 7