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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(X+6)/x+(4*(x-8))/x+4 = 0
(X+6)/x+(4*(x-8))/x+(4*x)/x = 0
4*(x-8)+X+4*x+6 = 0
X+4*x+4*x-26 = 0
X+8*x-26 = 0
(X+8*x-26)/x = 0
(X+8*x-26)/x = 0 // * x
X+8*x-26 = 0
X+8*x-26 = 0 // - X-26
8*x = -(X-26) // : 8
x = (-(X-26))/8
x = (26-X)/8
x = (26-X)/8
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