-2(ab-3a²)-[2b²-(5ab+a²)+2ab] ,
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![-2(ab-3a²)-[2b²-(5ab+a²)+2ab] ,](/uploads/image/z/3024245-29-5.jpg?t=-2%28ab-3a%26%23178%3B%29-%5B2b%26%23178%3B-%285ab%2Ba%26%23178%3B%29%2B2ab%5D+%2C)
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-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