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(x^2)/3-((8*x^1)/3)+15 = 0
(x^2)/3+(-8/3)*x+15 = 0
1/3*x^2-8/3*x+15 = 0
DELTA = (-8/3)^2-(1/3*4*15)
DELTA = -116/9
DELTA < 0
x belongs to the empty set
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