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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-((6*m)/(m^2))-25 = 0
5-6*m^-1-25 = 0
-6*m^-1 = 20 // : -6
m^-1 = -10/3
-1 < 0
1/(m^1) = -10/3 // * m^1
1 = -10/3*m^1 // : -10/3
-3/10 = m^1
m = -3/10
m = -3/10
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