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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.83 = 18/x // - 18/x
0.83-(18/x) = 0
0.83-18*x^-1 = 0
-18*x^-1 = -0.83 // : -18
x^-1 = 0.04611111
-1 < 0
1/(x^1) = 0.04611111 // * x^1
1 = 0.04611111*x^1 // : 0.04611111
21.68674751 = x^1
x = 21.68674751
x = 21.68674751
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