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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8-(17/x) = 3/x+4 // - 3/x+4
8-(17/x)-(3/x)-4 = 0
8-17*x^-1-3*x^-1-4 = 0
-20*x^-1 = -4 // : -20
x^-1 = 1/5
-1 < 0
1/(x^1) = 1/5 // * x^1
1 = 1/5*x^1 // : 1/5
5 = x^1
x = 5
x = 5
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