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(6 + 9r^3) + (7r^4 - 3 + 8r^3) - (4 - 5r)

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(6 + 9r^3) + (7r^4 - 3 + 8r^3) - (4 - 5r)

6 + 9r^3 + 7r^4 - 3 + 8r^3 - 4 + 5r

6- 4 - 3 + 7r^4 + 9r^3 + 8r^3 + 5r

-1 + 7r^4 + 17r^3 + 5r