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x in (-oo:+oo)
((5*x+1)^2)/3 = 9 // - 9
((5*x+1)^2)/3-9 = 0
((5*x+1)^2)/3+(-9*3)/3 = 0
(5*x+1)^2-9*3 = 0
25*x^2+10*x-26 = 0
25*x^2+10*x-26 = 0
25*x^2+10*x-26 = 0
DELTA = 10^2-(-26*4*25)
DELTA = 2700
DELTA > 0
x = (2700^(1/2)-10)/(2*25) or x = (-2700^(1/2)-10)/(2*25)
x = (30*3^(1/2)-10)/50 or x = (-30*3^(1/2)-10)/50
(x-((-30*3^(1/2)-10)/50))*(x-((30*3^(1/2)-10)/50)) = 0
((x-((-30*3^(1/2)-10)/50))*(x-((30*3^(1/2)-10)/50)))/3 = 0
((x-((-30*3^(1/2)-10)/50))*(x-((30*3^(1/2)-10)/50)))/3 = 0 // * 3
(x-((-30*3^(1/2)-10)/50))*(x-((30*3^(1/2)-10)/50)) = 0
( x-((-30*3^(1/2)-10)/50) )
x-((-30*3^(1/2)-10)/50) = 0 // + (-30*3^(1/2)-10)/50
x = (-30*3^(1/2)-10)/50
( x-((30*3^(1/2)-10)/50) )
x-((30*3^(1/2)-10)/50) = 0 // + (30*3^(1/2)-10)/50
x = (30*3^(1/2)-10)/50
x in { (-30*3^(1/2)-10)/50, (30*3^(1/2)-10)/50 }
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