Add. 5x² + 6xy + 7yz +8 and 8x² - 9xy+7yz-y
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Answer:
13x²-2xy+14yz-y+8
Step-by-step explanation:
5x²+6xy+7yz+8
+8x²-9xy+7yz-y
_______________
13x²-2xy+14yz-y+8
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