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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
28/6 = 112/m // - 112/m
28/6-(112/m) = 0
28/6-112*m^-1 = 0
-112*m^-1 = -14/3 // : -112
m^-1 = 1/24
-1 < 0
1/(m^1) = 1/24 // * m^1
1 = 1/24*m^1 // : 1/24
24 = m^1
m = 24
m = 24
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