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x in (-oo:+oo)
(x^2)/2 = 5*x // - 5*x
(x^2)/2-(5*x) = 0
(x^2)/2-5*x = 0
1/2*x^2-5*x = 0
DELTA = (-5)^2-(0*1/2*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+5)/(1/2*2) or x = (5-25^(1/2))/(1/2*2)
x = 10 or x = 0
x in { 0, 10 }
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