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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
9/5 = 36/n // - 36/n
9/5-(36/n) = 0
9/5-36*n^-1 = 0
-36*n^-1 = -9/5 // : -36
n^-1 = 1/20
-1 < 0
1/(n^1) = 1/20 // * n^1
1 = 1/20*n^1 // : 1/20
20 = n^1
n = 20
n = 20
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