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x in (-oo:+oo)
x^2-((2/3)*x)+1/9 = 8/9+1/9 // - 8/9+1/9
x^2-((2/3)*x)+1/9-(8/9)-(1/9) = 0
x^2+(-2/3)*x+1/9-8/9-1/9 = 0
x^2-2/3*x-8/9 = 0
DELTA = (-2/3)^2-(-8/9*1*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)+2/3)/(1*2) or x = (2/3-4^(1/2))/(1*2)
x = 4/3 or x = -2/3
x in { -2/3, 4/3 }
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