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(x-(1/3))*(3*x^2+3) = 0
(x-1/3)*(3*x^2+3) = 0
( 3*x^2+3 )
3*x^2 = -3 // : 3
x^2 = -1
( x-1/3 )
x-1/3 = 0 // + 1/3
x = 1/3
x = 1/3
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