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