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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
n+(2*n^2)/n = 43 // - 43
n+(2*n^2)/n-43 = 0
3*n-43 = 0 // + 43
3*n = 43 // : 3
n = 43/3
n = 43/3
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