а-(b-(a+d)) = а-(b-a-d) = a-b+a+d = 2a-b+d
a-(b-(a+d))=a-(b-a-d)=2a-b+d
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а-(b-(a+d)) = а-(b-a-d) = a-b+a+d = 2a-b+d
a-(b-(a+d))=a-(b-a-d)=2a-b+d