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(5/6)*x^2+(2/6)*x-((4/3)*x) = 0
(5/6)*x^2+(2/6)*x+(-4/3)*x = 0
5/6*x^2-x = 0
DELTA = (-1)^2-(0*5/6*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)+1)/(5/6*2) or x = (1-1^(1/2))/(5/6*2)
x = 6/5 or x = 0
x in { 0, 6/5 }
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