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