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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
16/38 = 200/m // - 200/m
16/38-(200/m) = 0
16/38-200*m^-1 = 0
-200*m^-1 = -8/19 // : -200
m^-1 = 1/475
-1 < 0
1/(m^1) = 1/475 // * m^1
1 = 1/475*m^1 // : 1/475
475 = m^1
m = 475
m = 475
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