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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9/6 = 18/m // - 18/m
9/6-(18/m) = 0
9/6-18*m^-1 = 0
-18*m^-1 = -3/2 // : -18
m^-1 = 1/12
-1 < 0
1/(m^1) = 1/12 // * m^1
1 = 1/12*m^1 // : 1/12
12 = m^1
m = 12
m = 12
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