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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
7/m = 63/54 // - 63/54
7/m-(63/54) = 0
7/m-7/6 = 0
7*m^-1 = 7/6 // : 7
m^-1 = 1/6
-1 < 0
1/(m^1) = 1/6 // * m^1
1 = 1/6*m^1 // : 1/6
6 = m^1
m = 6
m = 6
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