Answer:
5x³ - 7x² + 10y - 64
Explanation:
5x³ + 2(y + 4) - 7x² + 8(y - 9)
= 5x³ + 2y + 8 - 7x² + 8y - 72
= 5x³ - 7x² + 10y - 64
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