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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
136/n = 8/15 // - 8/15
136/n-(8/15) = 0
136/n-8/15 = 0
136*n^-1 = 8/15 // : 136
n^-1 = 1/255
-1 < 0
1/(n^1) = 1/255 // * n^1
1 = 1/255*n^1 // : 1/255
255 = n^1
n = 255
n = 255
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