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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
m-(6/m) = 5 // - 5
m-(6/m)-5 = 0
m-6*m^-1-5 = 0
1*m^1-6*m^-1-5*m^0 = 0
(1*m^2-5*m^1-6*m^0)/(m^1) = 0 // * m^2
m^1*(1*m^2-5*m^1-6*m^0) = 0
m^1
m^2-5*m-6 = 0
m^2-5*m-6 = 0
DELTA = (-5)^2-(-6*1*4)
DELTA = 49
DELTA > 0
m = (49^(1/2)+5)/(1*2) or m = (5-49^(1/2))/(1*2)
m = 6 or m = -1
m in { -1, 6}
m in { -1, 6 }
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