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x in (-oo:+oo)
((2*x+20)^2)/3 = 64 // - 64
((2*x+20)^2)/3-64 = 0
((2*x+20)^2)/3+(-64*3)/3 = 0
(2*x+20)^2-64*3 = 0
4*x^2+80*x+208 = 0
4*x^2+80*x+208 = 0
4*(x^2+20*x+52) = 0
x^2+20*x+52 = 0
DELTA = 20^2-(1*4*52)
DELTA = 192
DELTA > 0
x = (192^(1/2)-20)/(1*2) or x = (-192^(1/2)-20)/(1*2)
x = (8*3^(1/2)-20)/2 or x = (-8*3^(1/2)-20)/2
4*(x-((-8*3^(1/2)-20)/2))*(x-((8*3^(1/2)-20)/2)) = 0
(4*(x-((-8*3^(1/2)-20)/2))*(x-((8*3^(1/2)-20)/2)))/3 = 0
(4*(x-((-8*3^(1/2)-20)/2))*(x-((8*3^(1/2)-20)/2)))/3 = 0 // * 3
4*(x-((-8*3^(1/2)-20)/2))*(x-((8*3^(1/2)-20)/2)) = 0
( x-((-8*3^(1/2)-20)/2) )
x-((-8*3^(1/2)-20)/2) = 0 // + (-8*3^(1/2)-20)/2
x = (-8*3^(1/2)-20)/2
( x-((8*3^(1/2)-20)/2) )
x-((8*3^(1/2)-20)/2) = 0 // + (8*3^(1/2)-20)/2
x = (8*3^(1/2)-20)/2
x in { (-8*3^(1/2)-20)/2, (8*3^(1/2)-20)/2 }
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