-2(ab-3a²)-[2b²-(5ab+a²)+2ab] ,

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-2(ab-3a²)-[2b²-(5ab+a²)+2ab],-2(ab-3a²)-[2b²-(5ab+a²)+2ab],-2(ab-3a&#

-2(ab-3a²)-[2b²-(5ab+a²)+2ab] ,
-2(ab-3a²)-[2b²-(5ab+a²)+2ab] ,

-2(ab-3a²)-[2b²-(5ab+a²)+2ab] ,
-2(ab-3a²)-[2b²-(5ab+a²)+2ab]
=-2ab+6a²-[2b²-5ab-a²+2ab]
=-2ab+6a²-2b²+5ab+a²-2ab
=ab+7a²-2b²