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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1/3+1/4 = 1/n // - 1/n
1/3-(1/n)+1/4 = 0
1/3-n^-1+1/4 = 0
-1*n^-1 = -7/12 // : -1
n^-1 = 7/12
-1 < 0
1/(n^1) = 7/12 // * n^1
1 = 7/12*n^1 // : 7/12
12/7 = n^1
n = 12/7
n = 12/7
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