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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
65/m = 5 // - 5
65/m-5 = 0
65*m^-1 = 5 // : 65
m^-1 = 1/13
-1 < 0
1/(m^1) = 1/13 // * m^1
1 = 1/13*m^1 // : 1/13
13 = m^1
m = 13
m = 13
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