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