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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1.9/4 = 13/n // - 13/n
1.9/4-(13/n) = 0
1.9/4-13*n^-1 = 0
-13*n^-1 = -0.475 // : -13
n^-1 = 0.03653846
-1 < 0
1/(n^1) = 0.03653846 // * n^1
1 = 0.03653846*n^1 // : 0.03653846
27.3684222 = n^1
n = 27.3684222
n = 27.3684222
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