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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
m^-7 = 1/2 // - 1/2
m^-7-(1/2) = 0
m^-7-1/2 = 0
1*m^-7 = 1/2 // : 1
m^-7 = 1/2
-7 < 0
1/(m^7) = 1/2 // * m^7
1 = 1/2*m^7 // : 1/2
2 = m^7
m^7 = 2 // ^ 1/7
m = 2^(1/7)
m = 2^(1/7)
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