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-( 3m + n ) - [ 2m+{-m+(2m-2n-5)} -(n-6) ]
-3m - n - 2m - { -m + (2m - 2n - 5) } + ( n - 6 )
-5m - n + m - 2m + 2n + 5 + n - 6
-6m + 2n - 1