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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
18/6 = 45/m // - 45/m
18/6-(45/m) = 0
18/6-45*m^-1 = 0
-45*m^-1 = -3 // : -45
m^-1 = 1/15
-1 < 0
1/(m^1) = 1/15 // * m^1
1 = 1/15*m^1 // : 1/15
15 = m^1
m = 15
m = 15
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