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x in (-oo:+oo)
((x-2)^2)/3+3 = 0
((x-2)^2)/3+(3^2)/3 = 0
(x-2)^2+9 = 0
x^2-4*x+13 = 0
x^2-4*x+13 = 0
x^2-4*x+13 = 0
DELTA = (-4)^2-(1*4*13)
DELTA = -36
DELTA < 0
1 = 0
1/3 = 0
1/3 = 0 // * 3
1 = 0
x belongs to the empty set
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