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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9/m-17 = 21 // - 21
9/m-21-17 = 0
9*m^-1 = 38 // : 9
m^-1 = 38/9
-1 < 0
1/(m^1) = 38/9 // * m^1
1 = 38/9*m^1 // : 38/9
9/38 = m^1
m = 9/38
m = 9/38
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