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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)
4-((11*m)/(m^2))-25 = 0
4-11*m^-1-25 = 0
-11*m^-1 = 21 // : -11
m^-1 = -21/11
-1 < 0
1/(m^1) = -21/11 // * m^1
1 = -21/11*m^1 // : -21/11
-11/21 = m^1
m = -11/21
m = -11/21
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