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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 3/x-8 // - 3/x-8
1/x-(3/x)+8 = 0
1/x-3*x^-1+8 = 0
-2*x^-1 = -8 // : -2
x^-1 = 4
-1 < 0
1/(x^1) = 4 // * x^1
1 = 4*x^1 // : 4
1/4 = x^1
x = 1/4
x = 1/4
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