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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/n = 14/n+30 // - 14/n+30
2/n-(14/n)-30 = 0
2/n-14*n^-1-30 = 0
-12*n^-1 = 30 // : -12
n^-1 = -5/2
-1 < 0
1/(n^1) = -5/2 // * n^1
1 = -5/2*n^1 // : -5/2
-2/5 = n^1
n = -2/5
n = -2/5
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