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x in (-oo:+oo)
(1/3)*x = x^2+5 // - x^2+5
(1/3)*x-x^2-5 = 0
1/3*x-x^2-5 = 0
DELTA = (1/3)^2-(-5*(-1)*4)
DELTA = -179/9
DELTA < 0
x belongs to the empty set
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