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D( m )
m-5 = 0
m-5 = 0
m-5 = 0
m-5 = 0 // + 5
m = 5
m in (-oo:5) U (5:+oo)
m/(m-5)-6 = 5/(m-5) // - 5/(m-5)
m/(m-5)-(5/(m-5))-6 = 0
m/(m-5)-5*(m-5)^-1-6 = 0
m/(m-5)-5/(m-5)-6 = 0
m/(m-5)-5/(m-5)+(-6*(m-5))/(m-5) = 0
m-6*(m-5)-5 = 0
m-6*m-5+30 = 0
25-5*m = 0
(25-5*m)/(m-5) = 0
(25-5*m)/(m-5) = 0 // * m-5
25-5*m = 0
25-5*m = 0 // - 25
-5*m = -25 // : -5
m = -25/(-5)
m = 5
m in { 5}
m belongs to the empty set
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