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x in (-oo:+oo)
x*((5*x+9)/3) = 2 // - 2
x*((5*x+9)/3)-2 = 0
(x*(5*x+9))/3-2 = 0
(x*(5*x+9))/3+(-2*3)/3 = 0
x*(5*x+9)-2*3 = 0
5*x^2+9*x-6 = 0
5*x^2+9*x-6 = 0
5*x^2+9*x-6 = 0
DELTA = 9^2-(-6*4*5)
DELTA = 201
DELTA > 0
x = (201^(1/2)-9)/(2*5) or x = (-201^(1/2)-9)/(2*5)
x = (201^(1/2)-9)/10 or x = (-(201^(1/2)+9))/10
(x+(201^(1/2)+9)/10)*(x-((201^(1/2)-9)/10)) = 0
((x+(201^(1/2)+9)/10)*(x-((201^(1/2)-9)/10)))/3 = 0
((x+(201^(1/2)+9)/10)*(x-((201^(1/2)-9)/10)))/3 = 0 // * 3
(x+(201^(1/2)+9)/10)*(x-((201^(1/2)-9)/10)) = 0
( x+(201^(1/2)+9)/10 )
x+(201^(1/2)+9)/10 = 0 // - (201^(1/2)+9)/10
x = -((201^(1/2)+9)/10)
( x-((201^(1/2)-9)/10) )
x-((201^(1/2)-9)/10) = 0 // + (201^(1/2)-9)/10
x = (201^(1/2)-9)/10
x in { -((201^(1/2)+9)/10), (201^(1/2)-9)/10 }
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