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x in (-oo:+oo)
x^2+3*x+9/4 = -(9/4)-14 // + -(9/4)-14
x^2+3*x+9/4+9/4+14 = 0
x^2+3*x+37/2 = 0
DELTA = 3^2-(1*4*37/2)
DELTA = -65
DELTA < 0
x belongs to the empty set
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