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x in (-oo:+oo)
x*((5*x-2)/2)-18 = 0
(x*(5*x-2))/2-18 = 0
(x*(5*x-2))/2+(-18*2)/2 = 0
x*(5*x-2)-18*2 = 0
5*x^2-2*x-36 = 0
5*x^2-2*x-36 = 0
5*x^2-2*x-36 = 0
DELTA = (-2)^2-(-36*4*5)
DELTA = 724
DELTA > 0
x = (724^(1/2)+2)/(2*5) or x = (2-724^(1/2))/(2*5)
x = (2*181^(1/2)+2)/10 or x = (2-2*181^(1/2))/10
(x-((2-2*181^(1/2))/10))*(x-((2*181^(1/2)+2)/10)) = 0
((x-((2-2*181^(1/2))/10))*(x-((2*181^(1/2)+2)/10)))/2 = 0
((x-((2-2*181^(1/2))/10))*(x-((2*181^(1/2)+2)/10)))/2 = 0 // * 2
(x-((2-2*181^(1/2))/10))*(x-((2*181^(1/2)+2)/10)) = 0
( x-((2*181^(1/2)+2)/10) )
x-((2*181^(1/2)+2)/10) = 0 // + (2*181^(1/2)+2)/10
x = (2*181^(1/2)+2)/10
( x-((2-2*181^(1/2))/10) )
x-((2-2*181^(1/2))/10) = 0 // + (2-2*181^(1/2))/10
x = (2-2*181^(1/2))/10
x in { (2*181^(1/2)+2)/10, (2-2*181^(1/2))/10 }
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