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4*x^2-(8*x) = -16/3 // + -16/3
4*x^2-(8*x)-(-16/3) = 0
4*x^2-8*x+16/3 = 0
4*x^2-8*x+16/3 = 0
DELTA = (-8)^2-(4*4*16/3)
DELTA = -64/3
DELTA < 0
x belongs to the empty set
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