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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(-1/8)/m = -3/4 // + -3/4
(-1/8)/m-(-3/4) = 0
(-1/8)/m+3/4 = 0
-1/8*m^-1 = -3/4 // : -1/8
m^-1 = 6
-1 < 0
1/(m^1) = 6 // * m^1
1 = 6*m^1 // : 6
1/6 = m^1
m = 1/6
m = 1/6
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