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(2*x^2)/3-((7*x^1)/3)+3 = 0
(2*x^2)/3+(-7/3)*x+3 = 0
2/3*x^2-7/3*x+3 = 0
DELTA = (-7/3)^2-(2/3*3*4)
DELTA = -23/9
DELTA < 0
x belongs to the empty set
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