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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
-5/2 = 35/m // - 35/m
-(35/m)-5/2 = 0
-35*m^-1-5/2 = 0
-35*m^-1 = 5/2 // : -35
m^-1 = -1/14
-1 < 0
1/(m^1) = -1/14 // * m^1
1 = -1/14*m^1 // : -1/14
-14 = m^1
m = -14
m = -14
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