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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/6 = 75/n // - 75/n
5/6-(75/n) = 0
5/6-75*n^-1 = 0
-75*n^-1 = -5/6 // : -75
n^-1 = 1/90
-1 < 0
1/(n^1) = 1/90 // * n^1
1 = 1/90*n^1 // : 1/90
90 = n^1
n = 90
n = 90
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