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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
7/m-2 = 54 // - 54
7/m-54-2 = 0
7*m^-1 = 56 // : 7
m^-1 = 8
-1 < 0
1/(m^1) = 8 // * m^1
1 = 8*m^1 // : 8
1/8 = m^1
m = 1/8
m = 1/8
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