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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
24/22 = 84/n // - 84/n
24/22-(84/n) = 0
24/22-84*n^-1 = 0
-84*n^-1 = -12/11 // : -84
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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