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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = 42/7 // - 42/7
6/n-(42/7) = 0
6/n-6 = 0
6*n^-1 = 6 // : 6
n^-1 = 1
-1 < 0
1/(n^1) = 1 // * n^1
1 = 1*n^1 // : 1
1 = n^1
n = 1
n = 1
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