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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
12/8 = 0.3/m // - 0.3/m
12/8-(0.3/m) = 0
12/8-0.3*m^-1 = 0
-0.3*m^-1 = -3/2 // : -0.3
m^-1 = 5
-1 < 0
1/(m^1) = 5 // * m^1
1 = 5*m^1 // : 5
1/5 = m^1
m = 1/5
m = 1/5
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