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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
30/20 = 3/m // - 3/m
30/20-(3/m) = 0
30/20-3*m^-1 = 0
-3*m^-1 = -3/2 // : -3
m^-1 = 1/2
-1 < 0
1/(m^1) = 1/2 // * m^1
1 = 1/2*m^1 // : 1/2
2 = m^1
m = 2
m = 2
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