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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
18/m = 50/100 // - 50/100
18/m-(50/100) = 0
18/m-1/2 = 0
18*m^-1 = 1/2 // : 18
m^-1 = 1/36
-1 < 0
1/(m^1) = 1/36 // * m^1
1 = 1/36*m^1 // : 1/36
36 = m^1
m = 36
m = 36
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