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(1/2)*x^2-((4/3)*x)+4 = 0
(1/2)*x^2+(-4/3)*x+4 = 0
1/2*x^2-4/3*x+4 = 0
DELTA = (-4/3)^2-(1/2*4*4)
DELTA = -56/9
DELTA < 0
x belongs to the empty set
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