subtract 5mn-6m-7n from 11m-6mn-12n
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(11m-6mn-12n)-(5mn-6m-7n)
11m-6m-6mn-5mn-12n-7n
5m-11mn-5n ans.
11m-6m-6mn-5mn-12n-7n
5m-11mn-5n ans.
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