6m - 2m +7 - 4m+7, -8m + 2-7 - -8m-5, -8 + 2m-6m - -4m-8, 7m+ 2m- 5m - 4m, 1-m -m - 1-2m, 1-2m + m - 1-m, 3(2m-4n) - 6m-12n, -2m× 3n - -6mn, m (m- 2n+1) - m^2 -2mn +f, 12m ÷ -4n - -3m/n, 3 -(2m+n)-3n - 3-2m-4n, 2m (3-mn) - 6m- 2m^2n,

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