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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
105/n = 15/100 // - 15/100
105/n-(15/100) = 0
105/n-3/20 = 0
105*n^-1 = 3/20 // : 105
n^-1 = 1/700
-1 < 0
1/(n^1) = 1/700 // * n^1
1 = 1/700*n^1 // : 1/700
700 = n^1
n = 700
n = 700
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