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x in (-oo:+oo)
x^2-(4*x^2)-x-(12/64) = 0
x^2-4*x^2-x-3/16 = 0
-3*x^2-x-3/16 = 0
DELTA = (-1)^2-(-3*(-3/16)*4)
DELTA = -5/4
DELTA < 0
x belongs to the empty set
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