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x in (-oo:+oo)
5*x*((3*x-1)/2) = 11 // - 11
5*x*((3*x-1)/2)-11 = 0
(5*x*(3*x-1))/2-11 = 0
(5*x*(3*x-1))/2+(-11*2)/2 = 0
5*x*(3*x-1)-11*2 = 0
15*x^2-5*x-22 = 0
15*x^2-5*x-22 = 0
15*x^2-5*x-22 = 0
DELTA = (-5)^2-(-22*4*15)
DELTA = 1345
DELTA > 0
x = (1345^(1/2)+5)/(2*15) or x = (5-1345^(1/2))/(2*15)
x = (1345^(1/2)+5)/30 or x = (5-1345^(1/2))/30
(x-((5-1345^(1/2))/30))*(x-((1345^(1/2)+5)/30)) = 0
((x-((5-1345^(1/2))/30))*(x-((1345^(1/2)+5)/30)))/2 = 0
((x-((5-1345^(1/2))/30))*(x-((1345^(1/2)+5)/30)))/2 = 0 // * 2
(x-((5-1345^(1/2))/30))*(x-((1345^(1/2)+5)/30)) = 0
( x-((1345^(1/2)+5)/30) )
x-((1345^(1/2)+5)/30) = 0 // + (1345^(1/2)+5)/30
x = (1345^(1/2)+5)/30
( x-((5-1345^(1/2))/30) )
x-((5-1345^(1/2))/30) = 0 // + (5-1345^(1/2))/30
x = (5-1345^(1/2))/30
x in { (1345^(1/2)+5)/30, (5-1345^(1/2))/30 }
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