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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12/22 = 42/n // - 42/n
12/22-(42/n) = 0
12/22-42*n^-1 = 0
-42*n^-1 = -6/11 // : -42
n^-1 = 1/77
-1 < 0
1/(n^1) = 1/77 // * n^1
1 = 1/77*n^1 // : 1/77
77 = n^1
n = 77
n = 77
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