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x in (-oo:+oo)
(1/3)*(1/3)*x*x = 5*x // - 5*x
(1/3)*(1/3)*x*x-(5*x) = 0
(1/3)*(1/3)*x*x-5*x = 0
1/9*x^2-5*x = 0
DELTA = (-5)^2-(0*1/9*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+5)/(1/9*2) or x = (5-25^(1/2))/(1/9*2)
x = 45 or x = 0
x in { 0, 45 }
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