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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
7/m = 9/3 // - 9/3
7/m-(9/3) = 0
7/m-3 = 0
7*m^-1 = 3 // : 7
m^-1 = 3/7
-1 < 0
1/(m^1) = 3/7 // * m^1
1 = 3/7*m^1 // : 3/7
7/3 = m^1
m = 7/3
m = 7/3
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