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A in (-oo:+oo)
((4*A)/4)*A-((16/4)*A)+12+12 = 0
((4*A)/4)*A-4*A+12+12 = 0
A^2-4*A+24 = 0
DELTA = (-4)^2-(1*4*24)
DELTA = -80
DELTA < 0
A belongs to the empty set
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