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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-8/x = -18/x-5 // + -18/x-5
5-8/x-(-18/x) = 0
18*x^-1-8/x+5 = 0
10*x^-1 = -5 // : 10
x^-1 = -1/2
-1 < 0
1/(x^1) = -1/2 // * x^1
1 = -1/2*x^1 // : -1/2
-2 = x^1
x = -2
x = -2
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