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x in (-oo:+oo)
((1*(5/8)*x)/16)*x = x+9/16 // - x+9/16
((1*(5/8)*x)/16)*x-x-(9/16) = 0
(((5/8)*x)/16)*x-x-9/16 = 0
5/128*x^2-x-9/16 = 0
DELTA = (-1)^2-(-9/16*5/128*4)
DELTA = 557/512
DELTA > 0
x = ((557/512)^(1/2)+1)/(5/128*2) or x = (1-(557/512)^(1/2))/(5/128*2)
x = 64/5*((557/512)^(1/2)+1) or x = 64/5*(1-(557/512)^(1/2))
x in { 64/5*(1-(557/512)^(1/2)), 64/5*((557/512)^(1/2)+1) }
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