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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
10/6 = 15/m // - 15/m
10/6-(15/m) = 0
10/6-15*m^-1 = 0
-15*m^-1 = -5/3 // : -15
m^-1 = 1/9
-1 < 0
1/(m^1) = 1/9 // * m^1
1 = 1/9*m^1 // : 1/9
9 = m^1
m = 9
m = 9
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