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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/5 = 36/n // - 36/n
4/5-(36/n) = 0
4/5-36*n^-1 = 0
-36*n^-1 = -4/5 // : -36
n^-1 = 1/45
-1 < 0
1/(n^1) = 1/45 // * n^1
1 = 1/45*n^1 // : 1/45
45 = n^1
n = 45
n = 45
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