m^2-2m-2m+4-m^2-2m-2m-4=-8m/m^2-4
-8m/m^2-4*m^2-4/8m=-1
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m^2-2m-2m+4-m^2-2m-2m-4=-8m/m^2-4
-8m/m^2-4*m^2-4/8m=-1