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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
15/m+62 = 23 // - 23
15/m-23+62 = 0
15*m^-1 = -39 // : 15
m^-1 = -13/5
-1 < 0
1/(m^1) = -13/5 // * m^1
1 = -13/5*m^1 // : -13/5
-5/13 = m^1
m = -5/13
m = -5/13
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