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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9/m = 18/4 // - 18/4
9/m-(18/4) = 0
9/m-9/2 = 0
9*m^-1 = 9/2 // : 9
m^-1 = 1/2
-1 < 0
1/(m^1) = 1/2 // * m^1
1 = 1/2*m^1 // : 1/2
2 = m^1
m = 2
m = 2
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