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