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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
20/n+22 = 0
20*n^-1 = -22 // : 20
n^-1 = -11/10
-1 < 0
1/(n^1) = -11/10 // * n^1
1 = -11/10*n^1 // : -11/10
-10/11 = n^1
n = -10/11
n = -10/11
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