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(1/3)*X^2-((2/3)*x)+1/6 = 0
(1/3)*X^2+(-2/3)*x+1/6 = 0
1/3*X^2-2/3*x+1/6 = 0 // - 1/3*X^2+1/6
-2/3*x = -(1/3*X^2+1/6) // : -2/3
x = (-(1/3*X^2+1/6))/(-2/3)
x = 3/2*(1/3*X^2+1/6)
x = 3/2*(1/3*X^2+1/6)
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