5x² + 6xy + 7yz +8 + 8x² - 9xy + 7yz -9
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Step-by-step explanation:
5x²+6xy+7yz+8+8x²-9xy+7yz-9
5x²+8x²+6xy-9xy+7yz+7yz+8-9
13x²-3xy+14yz-1
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