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x in (-oo:+oo)
x^2-((3/4)*x)+4 = 0
x^2+(-3/4)*x+4 = 0
x^2-3/4*x+4 = 0
DELTA = (-3/4)^2-(1*4*4)
DELTA = -247/16
DELTA < 0
x belongs to the empty set
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