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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
10.5/n = 7/10 // - 7/10
10.5/n-(7/10) = 0
10.5/n-7/10 = 0
10.5*n^-1 = 7/10 // : 10.5
n^-1 = 0.06666667
-1 < 0
1/(n^1) = 0.06666667 // * n^1
1 = 0.06666667*n^1 // : 0.06666667
14.99999925 = n^1
n = 14.99999925
n = 14.99999925
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