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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/2 = 11/n // - 11/n
7/2-(11/n) = 0
7/2-11*n^-1 = 0
-11*n^-1 = -7/2 // : -11
n^-1 = 7/22
-1 < 0
1/(n^1) = 7/22 // * n^1
1 = 7/22*n^1 // : 7/22
22/7 = n^1
n = 22/7
n = 22/7
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