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x in (-oo:+oo)
x*x-((8/9)*x) = 0
x*x+(-8/9)*x = 0
x^2-8/9*x = 0
DELTA = (-8/9)^2-(0*1*4)
DELTA = 64/81
DELTA > 0
x = ((64/81)^(1/2)+8/9)/(1*2) or x = (8/9-(64/81)^(1/2))/(1*2)
x = 8/9 or x = 0
x in { 0, 8/9 }
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