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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(X-5)/8 = 4/(x-1) // - 4/(x-1)
(X-5)/8-(4/(x-1)) = 0
(X-5)/8-4*(x-1)^-1 = 0
(X-5)/8-4/(x-1) = 0
((X-5)*(x-1))/(8*(x-1))+(-4*8)/(8*(x-1)) = 0
(X-5)*(x-1)-4*8 = 0
X*x-X-5*x-27 = 0
(X*x-X-5*x-27)/(8*(x-1)) = 0
(X*x-X-5*x-27)/(8*(x-1)) = 0 // * 8*(x-1)
X*x-X-5*x-27 = 0
-X-5*x-27 = 0 // + -X-27
-5*x = -(-X-27) // : -5
x = (-(-X-27))/(-5)
x = (X+27)/(-5)
x = (X+27)/(-5)
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