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