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(3*x^2)/3-((17*x^1)/3)+20 = 0
(3*x^2)/3+(-17/3)*x+20 = 0
x^2-17/3*x+20 = 0
DELTA = (-17/3)^2-(1*4*20)
DELTA = -431/9
DELTA < 0
x belongs to the empty set
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