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