(6m^2n-6m^2n^2-3m^2)/(-3m^2)
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(6m^2n-6m^2n^2-3m^2)/(-3m^2)
=6m^2n/(-3m^2)-6m^2n^2/(-3m^2)-3m^2/(-3m^2)
=-2n+2n^2+1
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