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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
7/m = 2/6 // - 2/6
7/m-(2/6) = 0
7/m-1/3 = 0
7*m^-1 = 1/3 // : 7
m^-1 = 1/21
-1 < 0
1/(m^1) = 1/21 // * m^1
1 = 1/21*m^1 // : 1/21
21 = m^1
m = 21
m = 21
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