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From the sum of 2y^2+3yz, -y^2-yz-z^2 ...

From the sum of `2y^2+3yz, -y^2-yz-z^2 and yz+2z^2,` subtract the sum of `3y^2-z^2 and -y^2+yz+z^2`

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To solve the problem step by step, we will first find the sum of the three expressions and then the sum of the two expressions, followed by subtracting the second sum from the first sum. ### Step 1: Find the sum of the first three expressions The first three expressions are: 1. \(2y^2 + 3yz\) 2. \(-y^2 - yz - z^2\) 3. \(yz + 2z^2\) ...
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