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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
14/3 = 20/n // - 20/n
14/3-(20/n) = 0
14/3-20*n^-1 = 0
-20*n^-1 = -14/3 // : -20
n^-1 = 7/30
-1 < 0
1/(n^1) = 7/30 // * n^1
1 = 7/30*n^1 // : 7/30
30/7 = n^1
n = 30/7
n = 30/7
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