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x in (-oo:+oo)
x^2-((8/3)*x) = 0
x^2+(-8/3)*x = 0
x^2-8/3*x = 0
DELTA = (-8/3)^2-(0*1*4)
DELTA = 64/9
DELTA > 0
x = ((64/9)^(1/2)+8/3)/(1*2) or x = (8/3-(64/9)^(1/2))/(1*2)
x = 8/3 or x = 0
x in { 0, 8/3 }
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