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((5/9)*x^2)/3 = x // - x
((5/9)*x^2)/3-x = 0
5/27*x^2-x = 0
DELTA = (-1)^2-(0*5/27*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)+1)/(5/27*2) or x = (1-1^(1/2))/(5/27*2)
x = 27/5 or x = 0
x in { 0, 27/5 }
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