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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
-12/m = 3 // - 3
-12/m-3 = 0
-12*m^-1 = 3 // : -12
m^-1 = -1/4
-1 < 0
1/(m^1) = -1/4 // * m^1
1 = -1/4*m^1 // : -1/4
-4 = m^1
m = -4
m = -4
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