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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(8*m)/m-(32/m)-4+4 = 0
(8*m)/m-32*m^-1-4+4 = 0
-32*m^-1 = -8 // : -32
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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