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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9/m-((3/2)*m) = 15/m // - 15/m
9/m-((3/2)*m)-(15/m) = 0
(-3/2)*m+9/m-15*m^-1 = 0
-3/2*m^1-6*m^-1 = 0
(-3/2*m^2-6*m^0)/(m^1) = 0 // * m^2
m^1*(-3/2*m^2-6*m^0) = 0
m^1
(-3/2)*m^2-6 = 0
(-3/2)*m^2-6 = 0
DELTA = 0^2-(-6*4*(-3/2))
DELTA = -36
DELTA < 0
m in { }
m belongs to the empty set
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