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D( m )
m^2 = 0
m^2 = 0
m^2 = 0
1*m^2 = 0 // : 1
m^2 = 0
m = 0
m in (-oo:0) U (0:+oo)
5-((9*m)/(m^2))-16 = 0
5-9*m^-1-16 = 0
-9*m^-1 = 11 // : -9
m^-1 = -11/9
-1 < 0
1/(m^1) = -11/9 // * m^1
1 = -11/9*m^1 // : -11/9
-9/11 = m^1
m = -9/11
m = -9/11
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