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