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3*x^2 = (4/3)*x // - (4/3)*x
3*x^2-((4/3)*x) = 0
3*x^2+(-4/3)*x = 0
3*x^2-4/3*x = 0
DELTA = (-4/3)^2-(0*3*4)
DELTA = 16/9
DELTA > 0
x = ((16/9)^(1/2)+4/3)/(2*3) or x = (4/3-(16/9)^(1/2))/(2*3)
x = 4/9 or x = 0
x in { 0, 4/9 }
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