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((4/3)*x^2)/3-(((2/3)*x^1)/3) = 0
((4/3)*x^2)/3+(-2/9)*x = 0
4/9*x^2-2/9*x = 0
DELTA = (-2/9)^2-(0*4/9*4)
DELTA = 4/81
DELTA > 0
x = ((4/81)^(1/2)+2/9)/(4/9*2) or x = (2/9-(4/81)^(1/2))/(4/9*2)
x = 1/2 or x = 0
x in { 0, 1/2 }
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