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D( m )
m-9 = 0
m-9 = 0
m-9 = 0
m-9 = 0 // + 9
m = 9
m in (-oo:9) U (9:+oo)
5/(m-9) = 10/4 // - 10/4
5/(m-9)-(10/4) = 0
5/(m-9)-5/2 = 0
(2*5)/(2*(m-9))+(-5*(m-9))/(2*(m-9)) = 0
2*5-5*(m-9) = 0
55-5*m = 0
(55-5*m)/(2*(m-9)) = 0
(55-5*m)/(2*(m-9)) = 0 // * 2*(m-9)
55-5*m = 0
55-5*m = 0 // - 55
-5*m = -55 // : -5
m = -55/(-5)
m = 11
m = 11
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