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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(1/4)/m = 36 // - 36
(1/4)/m-36 = 0
1/4*m^-1 = 36 // : 1/4
m^-1 = 144
-1 < 0
1/(m^1) = 144 // * m^1
1 = 144*m^1 // : 144
1/144 = m^1
m = 1/144
m = 1/144
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