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