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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12.5/n = 5/16 // - 5/16
12.5/n-(5/16) = 0
12.5/n-5/16 = 0
12.5*n^-1 = 5/16 // : 12.5
n^-1 = 0.025
-1 < 0
1/(n^1) = 0.025 // * n^1
1 = 0.025*n^1 // : 0.025
40 = n^1
n = 40
n = 40
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