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x in (-oo:+oo)
x^2-((1/3)*x)+3/4 = 0
x^2+(-1/3)*x+3/4 = 0
x^2-1/3*x+3/4 = 0
DELTA = (-1/3)^2-(3/4*1*4)
DELTA = -26/9
DELTA < 0
x belongs to the empty set
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