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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
84/n = 4/100 // - 4/100
84/n-(4/100) = 0
84/n-1/25 = 0
84*n^-1 = 1/25 // : 84
n^-1 = 1/2100
-1 < 0
1/(n^1) = 1/2100 // * n^1
1 = 1/2100*n^1 // : 1/2100
2100 = n^1
n = 2100
n = 2100
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