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(2/3-x)^3-((1/3)*(2/3-x))-(2/27) = 0
(2/3-x)^3+(-1/3)*(2/3-x)-2/27 = 0
(2/3-x)^3-1/3*(2/3-x)-2/27 = 0
(27*(2/3-x)^3)/27+(-1/3*27*(2/3-x))/27-2/27 = 0
27*(2/3-x)^3-1/3*27*(2/3-x)-2 = 0
54*x^2-27*x^3-27*x-2+2 = 0
54*x^2-27*x^3-27*x = 0
54*x^2-27*x^3-27*x = 0
27*x*(2*x-x^2-1) = 0
2*x-x^2-1 = 0
DELTA = 2^2-(-1*(-1)*4)
DELTA = 0
x = -2/(-1*2)
x = 1 or x = 1
27*x*(x-1)^2 = 0
(27*x*(x-1)^2)/27 = 0
(27*x*(x-1)^2)/27 = 0 // * 27
27*x*(x-1)^2 = 0
( 27*x )
27*x = 0 // : 27
x = 0
( x-1 )
x-1 = 0 // + 1
x = 1
x in { 0, 1, 1 }
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