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x in (-oo:+oo)
x*((5*x+80)/3) = 3 // - 3
x*((5*x+80)/3)-3 = 0
(x*(5*x+80))/3-3 = 0
(x*(5*x+80))/3+(-3*3)/3 = 0
x*(5*x+80)-3*3 = 0
5*x^2+80*x-9 = 0
5*x^2+80*x-9 = 0
5*x^2+80*x-9 = 0
DELTA = 80^2-(-9*4*5)
DELTA = 6580
DELTA > 0
x = (6580^(1/2)-80)/(2*5) or x = (-6580^(1/2)-80)/(2*5)
x = (2*1645^(1/2)-80)/10 or x = (-2*1645^(1/2)-80)/10
(x-((-2*1645^(1/2)-80)/10))*(x-((2*1645^(1/2)-80)/10)) = 0
((x-((-2*1645^(1/2)-80)/10))*(x-((2*1645^(1/2)-80)/10)))/3 = 0
((x-((-2*1645^(1/2)-80)/10))*(x-((2*1645^(1/2)-80)/10)))/3 = 0 // * 3
(x-((-2*1645^(1/2)-80)/10))*(x-((2*1645^(1/2)-80)/10)) = 0
( x-((-2*1645^(1/2)-80)/10) )
x-((-2*1645^(1/2)-80)/10) = 0 // + (-2*1645^(1/2)-80)/10
x = (-2*1645^(1/2)-80)/10
( x-((2*1645^(1/2)-80)/10) )
x-((2*1645^(1/2)-80)/10) = 0 // + (2*1645^(1/2)-80)/10
x = (2*1645^(1/2)-80)/10
x in { (-2*1645^(1/2)-80)/10, (2*1645^(1/2)-80)/10 }
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