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D( x )
(x-1)^4 = 0
(x-1)^4 = 0
(x-1)^4 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
((X-1)^2*(3*x-1)-(2*3*(x-1)))/((x-1)^4) = 0
((X-1)^2*(3*x-1)-6*(x-1))/((x-1)^4) = 0
(X-1)^2*(3*x-1)-6*(x-1) = 0
(X-1)^2*(3*x-1)-6*(x-1) = 0
3*X^2*x-X^2-6*X*x+2*X-3*x+5 = 0
3*X^2*x-X^2-6*X*x+2*X-3*x+5 = 0
(3*X^2*x-X^2-6*X*x+2*X-3*x+5)/((x-1)^4) = 0
2*X-X^2-3*x+5 = 0 // - 2*X-X^2+5
-3*x = -(2*X-X^2+5) // : -3
x = (-(2*X-X^2+5))/(-3)
x = (2*X-X^2+5)/3
x = (2*X-X^2+5)/3
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