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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
7/m = 5/35 // - 5/35
7/m-(5/35) = 0
7/m-1/7 = 0
7*m^-1 = 1/7 // : 7
m^-1 = 1/49
-1 < 0
1/(m^1) = 1/49 // * m^1
1 = 1/49*m^1 // : 1/49
49 = m^1
m = 49
m = 49
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