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x in (-oo:+oo)
x^2 = (5/8)*x // - (5/8)*x
x^2-((5/8)*x) = 0
x^2+(-5/8)*x = 0
x^2-5/8*x = 0
DELTA = (-5/8)^2-(0*1*4)
DELTA = 25/64
DELTA > 0
x = ((25/64)^(1/2)+5/8)/(1*2) or x = (5/8-(25/64)^(1/2))/(1*2)
x = 5/8 or x = 0
x in { 0, 5/8 }
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