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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
0.4 = 36/n // - 36/n
0.4-(36/n) = 0
0.4-36*n^-1 = 0
-36*n^-1 = -0.4 // : -36
n^-1 = 0.01111111
-1 < 0
1/(n^1) = 0.01111111 // * n^1
1 = 0.01111111*n^1 // : 0.01111111
90.000009 = n^1
n = 90.000009
n = 90.000009
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