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D( m )
m-3 = 0
m-9 = 0
m-3 = 0
m-3 = 0
m-3 = 0 // + 3
m = 3
m-9 = 0
m-9 = 0
m-9 = 0 // + 9
m = 9
m in (-oo:3) U (3:9) U (9:+oo)
5/(m-3) = 8/(m-9) // - 8/(m-9)
5/(m-3)-(8/(m-9)) = 0
5/(m-3)-8*(m-9)^-1 = 0
5/(m-3)-8/(m-9) = 0
(5*(m-9))/((m-3)*(m-9))+(-8*(m-3))/((m-3)*(m-9)) = 0
5*(m-9)-8*(m-3) = 0
-3*m-21 = 0
(-3*m-21)/((m-3)*(m-9)) = 0
(-3*m-21)/((m-3)*(m-9)) = 0 // * (m-3)*(m-9)
-3*m-21 = 0
-3*m-21 = 0 // + 21
-3*m = 21 // : -3
m = 21/(-3)
m = -7
m = -7
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