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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9.5/m = 9.5 // - 9.5
9.5/m-9.5 = 0
9.5*m^-1 = 9.5 // : 9.5
m^-1 = 1
-1 < 0
1/(m^1) = 1 // * m^1
1 = 1*m^1 // : 1
1 = m^1
m = 1
m = 1
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