Simplify 2-3z²+5yz+7y²-8+z²-6yz-9y²+1-2z²-2yz-y²
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hope this may help you.
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(2-8+1)-(3-1+2)z2-(5-6-2)y2-(7-9+1)y2
-5-4z2-3yz2-3y2 is the correct answer
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