subtract the sum of

z square + yz - y square and 3y square - z square from the sum of yz + 2z square , 2y square + 3y square, -y square - z square - yz

what is the answer of this expression ?

subtract the sum of

z square + yz - y square and 3y square - z square from the sum of yz + 2z square , 2y square + 3y square, -y square - z square - yz

what is the answer of this expression ?

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