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D( n )
n = 0
n^1 = 0
n = 0
n = 0
n^1 = 0
n^1 = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n-((7/(n^1))/2)-6 = 0
3/n+(-7/2)*n^-1-6 = 0
-1/2*n^-1 = 6 // : -1/2
n^-1 = -12
-1 < 0
1/(n^1) = -12 // * n^1
1 = -12*n^1 // : -12
-1/12 = n^1
n = -1/12
n = -1/12
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