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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-70/14 = 35/n // - 35/n
-(35/n)-70/14 = 0
-35*n^-1-70/14 = 0
-35*n^-1 = 5 // : -35
n^-1 = -1/7
-1 < 0
1/(n^1) = -1/7 // * n^1
1 = -1/7*n^1 // : -1/7
-7 = n^1
n = -7
n = -7
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