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(5xy - y^2) - (3yz + 2xy) + (3y^2 - 4xy)

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(5xy - y^2) - (3yz + 2xy) + (3y^2 - 4xy)=\\ 5xy-y^2-3yz-2xy+3y^2-4xy=\\ 2y^2-xy-3yz
User Erwin Alberto
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(5xy - y^2) - (3yz + 2xy) + (3y^2 - 4xy) \\= 5xy-y^2-3yz-2xy+3y^2-4xy \\ =2y^2-xy-3yz
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