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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/m = 15/35 // - 15/35
3/m-(15/35) = 0
3/m-3/7 = 0
3*m^-1 = 3/7 // : 3
m^-1 = 1/7
-1 < 0
1/(m^1) = 1/7 // * m^1
1 = 1/7*m^1 // : 1/7
7 = m^1
m = 7
m = 7
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