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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
-9/m = 3/2 // - 3/2
-9/m-(3/2) = 0
-9/m-3/2 = 0
-9*m^-1 = 3/2 // : -9
m^-1 = -1/6
-1 < 0
1/(m^1) = -1/6 // * m^1
1 = -1/6*m^1 // : -1/6
-6 = m^1
m = -6
m = -6
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