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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
42/14 = 6/n // - 6/n
42/14-(6/n) = 0
42/14-6*n^-1 = 0
-6*n^-1 = -3 // : -6
n^-1 = 1/2
-1 < 0
1/(n^1) = 1/2 // * n^1
1 = 1/2*n^1 // : 1/2
2 = n^1
n = 2
n = 2
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