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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/3 = 35/n // - 35/n
7/3-(35/n) = 0
7/3-35*n^-1 = 0
-35*n^-1 = -7/3 // : -35
n^-1 = 1/15
-1 < 0
1/(n^1) = 1/15 // * n^1
1 = 1/15*n^1 // : 1/15
15 = n^1
n = 15
n = 15
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