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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)
2/11 = 4/(x-1) // - 4/(x-1)
2/11-(4/(x-1)) = 0
2/11-4*(x-1)^-1 = 0
2/11-4/(x-1) = 0
(-4*11)/(11*(x-1))+(2*(x-1))/(11*(x-1)) = 0
2*(x-1)-4*11 = 0
2*x-46 = 0
(2*x-46)/(11*(x-1)) = 0
(2*x-46)/(11*(x-1)) = 0 // * 11*(x-1)
2*x-46 = 0
2*x-46 = 0 // + 46
2*x = 46 // : 2
x = 46/2
x = 23
x = 23
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