Add (-8p^3+9p^2q-5pq^2)+(8p^3-pq+5q^2)

$(- 8 p^{3} + 9 p^{2} q - 5 p q^{2}) + (8 p^{3} - p q + 5 q^{2})$

Remove parentheses.

$- 8 p^{3} + 9 p^{2} q - 5 p q^{2} + 8 p^{3} - p q + 5 q^{2}$

Combine the opposite terms in $- 8 p^{3} + 9 p^{2} q - 5 p q^{2} + 8 p^{3} - p q + 5 q^{2}$ .

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Add $- 8 p^{3}$ and $8 p^{3}$ .

$9 p^{2} q - 5 p q^{2} + 0 - p q + 5 q^{2}$

Add $9 p^{2} q - 5 p q^{2}$ and $0$ .

$9 p^{2} q - 5 p q^{2} - p q + 5 q^{2}$

Add (-8p^3+9p^2q-5pq^2)+(8p^3-pq+5q^2)

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