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x in (-oo:+oo)
x*((9*x-4)/3) = 7/3 // - 7/3
x*((9*x-4)/3)-(7/3) = 0
x*((9*x-4)/3)-7/3 = 0
(x*(9*x-4))/3-7/3 = 0
x*(9*x-4)-7 = 0
9*x^2-4*x-7 = 0
9*x^2-4*x-7 = 0
9*x^2-4*x-7 = 0
DELTA = (-4)^2-(-7*4*9)
DELTA = 268
DELTA > 0
x = (268^(1/2)+4)/(2*9) or x = (4-268^(1/2))/(2*9)
x = (2*67^(1/2)+4)/18 or x = (4-2*67^(1/2))/18
(x-((4-2*67^(1/2))/18))*(x-((2*67^(1/2)+4)/18)) = 0
((x-((4-2*67^(1/2))/18))*(x-((2*67^(1/2)+4)/18)))/3 = 0
((x-((4-2*67^(1/2))/18))*(x-((2*67^(1/2)+4)/18)))/3 = 0 // * 3
(x-((4-2*67^(1/2))/18))*(x-((2*67^(1/2)+4)/18)) = 0
( x-((2*67^(1/2)+4)/18) )
x-((2*67^(1/2)+4)/18) = 0 // + (2*67^(1/2)+4)/18
x = (2*67^(1/2)+4)/18
( x-((4-2*67^(1/2))/18) )
x-((4-2*67^(1/2))/18) = 0 // + (4-2*67^(1/2))/18
x = (4-2*67^(1/2))/18
x in { (2*67^(1/2)+4)/18, (4-2*67^(1/2))/18 }
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