Combine like terms:
(-8y² - 9y) + (8y³ + 9y² - 2y)
8y³ - 8y² + 9y² - 9y - 2y
8y³ (- 8y² + 9y²) (- 9y - 2y)
8y³ + y² - 11y
8y³ + y² - 11y is your answer
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8 y3+y2-11y would be the simplified answer.
