a-(b-(a-b)-(b+a)-(a-b))=a-(b-a+b-b-a-a+b)=a-(2b-3a)=a-2b+3a=4a-2b
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a-(b-(a-b)-(b+a)-(a-b))=a-(b-a+b-b-a-a+b)=a-(2b-3a)=a-2b+3a=4a-2b