subtract 9m+2n-6mn from 10m+2n-7mn
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(10m + 2n - 7mn) - (9m + 2n - 6mn)
= 10m + 2n - 7mn - 9m - 2n + 6mn
= 10m - 9m + 2n - 2n - 7mn + 6mn
= m - mn
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