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D( x )
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0 // + 5
3*x = 5 // : 3
x = 5/3
x in (-oo:5/3) U (5/3:+oo)
(x^2-x-1)/(3*x-5)-1 = 0
(x^2-x-1)/(3*x-5)+(-1*(3*x-5))/(3*x-5) = 0
x^2-1*(3*x-5)-x-1 = 0
x^2-4*x+4 = 0
x^2-4*x+4 = 0
x^2-4*x+4 = 0
DELTA = (-4)^2-(1*4*4)
DELTA = 0
x = 4/(1*2)
x = 2 or x = 2
(x-2)^2 = 0
((x-2)^2)/(3*x-5) = 0
((x-2)^2)/(3*x-5) = 0 // * 3*x-5
(x-2)^2 = 0
x-2 = 0 // + 2
x = 2
x in { 2, 2 }
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