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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
54 = 6/m // - 6/m
54-(6/m) = 0
54-6*m^-1 = 0
-6*m^-1 = -54 // : -6
m^-1 = 9
-1 < 0
1/(m^1) = 9 // * m^1
1 = 9*m^1 // : 9
1/9 = m^1
m = 1/9
m = 1/9
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