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x in (-oo:+oo)
((x-1)^2)/3-x+1 = 0
((x-1)^2)/3+(3*(-x))/3+(1*3)/3 = 0
(x-1)^2+3*(-x)+1*3 = 0
x^2-5*x+1+3 = 0
x^2-5*x+4 = 0
x^2-5*x+4 = 0
x^2-5*x+4 = 0
DELTA = (-5)^2-(1*4*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)+5)/(1*2) or x = (5-9^(1/2))/(1*2)
x = 4 or x = 1
(x-1)*(x-4) = 0
((x-1)*(x-4))/3 = 0
((x-1)*(x-4))/3 = 0 // * 3
(x-1)*(x-4) = 0
( x-1 )
x-1 = 0 // + 1
x = 1
( x-4 )
x-4 = 0 // + 4
x = 4
x in { 1, 4 }
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