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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
34/x-5+8 = 18/x-5 // - 18/x-5
34/x-(18/x)-5+5+8 = 0
34/x-18*x^-1-5+5+8 = 0
16*x^-1 = -8 // : 16
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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