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x in (-oo:+oo)
x^2-((28/2)*x^2)+3*x-(6*x)-8 = 0
x^2-14*x^2+3*x-6*x-8 = 0
-13*x^2-3*x-8 = 0
DELTA = (-3)^2-(-13*(-8)*4)
DELTA = -407
DELTA < 0
x belongs to the empty set
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