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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
90/n = 36/3 // - 36/3
90/n-(36/3) = 0
90/n-12 = 0
90*n^-1 = 12 // : 90
n^-1 = 2/15
-1 < 0
1/(n^1) = 2/15 // * n^1
1 = 2/15*n^1 // : 2/15
15/2 = n^1
n = 15/2
n = 15/2
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