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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
170/n = 10/13 // - 10/13
170/n-(10/13) = 0
170/n-10/13 = 0
170*n^-1 = 10/13 // : 170
n^-1 = 1/221
-1 < 0
1/(n^1) = 1/221 // * n^1
1 = 1/221*n^1 // : 1/221
221 = n^1
n = 221
n = 221
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