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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
8/x-(18/x)+5 = 0
8/x-18*x^-1+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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