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x in (-oo:+oo)
(x-(1/3))^2 = 4/9 // - 4/9
(x-(1/3))^2-(4/9) = 0
(x-1/3)^2-4/9 = 0
(9*(x-1/3)^2)/9-4/9 = 0
9*(x-1/3)^2-4 = 0
9*x^2-6*x-3 = 0
9*x^2-6*x-3 = 0
3*(3*x^2-2*x-1) = 0
3*x^2-2*x-1 = 0
DELTA = (-2)^2-(-1*3*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+2)/(2*3) or x = (2-16^(1/2))/(2*3)
x = 1 or x = -1/3
3*(x+1/3)*(x-1) = 0
(3*(x+1/3)*(x-1))/9 = 0
(3*(x+1/3)*(x-1))/9 = 0 // * 9
3*(x+1/3)*(x-1) = 0
( x+1/3 )
x+1/3 = 0 // - 1/3
x = -1/3
( x-1 )
x-1 = 0 // + 1
x = 1
x in { -1/3, 1 }
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