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x in (-oo:+oo)
x = (1/2)*x^2+4*x+6 // - (1/2)*x^2+4*x+6
x-((1/2)*x^2)-(4*x)-6 = 0
(-1/2)*x^2+x-4*x-6 = 0
-1/2*x^2-3*x-6 = 0
DELTA = (-3)^2-(-6*(-1/2)*4)
DELTA = -3
DELTA < 0
x belongs to the empty set
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