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x in (-oo:+oo)
16*x^2-((1/2)*x)+1/16 = x-4 // - x-4
16*x^2-((1/2)*x)-x+1/16+4 = 0
16*x^2+(-1/2)*x-x+1/16+4 = 0
16*x^2-3/2*x+65/16 = 0
DELTA = (-3/2)^2-(4*65/16*16)
DELTA = -1031/4
DELTA < 0
x belongs to the empty set
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