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D( m )
m-8 = 0
m-8 = 0
m-8 = 0
m-8 = 0 // + 8
m = 8
m in (-oo:8) U (8:+oo)
4/(m-8) = 8/2 // - 8/2
4/(m-8)-(8/2) = 0
4/(m-8)-4 = 0
4/(m-8)+(-4*(m-8))/(m-8) = 0
4-4*(m-8) = 0
36-4*m = 0
(36-4*m)/(m-8) = 0
(36-4*m)/(m-8) = 0 // * m-8
36-4*m = 0
36-4*m = 0 // - 36
-4*m = -36 // : -4
m = -36/(-4)
m = 9
m = 9
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