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(2*x^2)/3-(4*x) = 0
(2*x^2)/3-4*x = 0
2/3*x^2-4*x = 0
DELTA = (-4)^2-(0*2/3*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+4)/(2/3*2) or x = (4-16^(1/2))/(2/3*2)
x = 6 or x = 0
x in { 0, 6 }
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