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D( m )
2*m-4 = 0
2*m-4 = 0
2*m-4 = 0
2*m-4 = 0 // + 4
2*m = 4 // : 2
m = 4/2
m = 2
m in (-oo:2) U (2:+oo)
7/(2*m-4) = 1 // - 1
7/(2*m-4)-1 = 0
7/(2*m-4)+(-1*(2*m-4))/(2*m-4) = 0
7-1*(2*m-4) = 0
11-2*m = 0
(11-2*m)/(2*m-4) = 0
(11-2*m)/(2*m-4) = 0 // * 2*m-4
11-2*m = 0
11-2*m = 0 // - 11
-2*m = -11 // : -2
m = -11/(-2)
m = 11/2
m = 11/2
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