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