-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
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-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]