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(1/3)*x^2-((20/9)*x)-(7/9) = 0
(1/3)*x^2+(-20/9)*x-7/9 = 0
1/3*x^2-20/9*x-7/9 = 0
DELTA = (-20/9)^2-(-7/9*1/3*4)
DELTA = 484/81
DELTA > 0
x = ((484/81)^(1/2)+20/9)/(1/3*2) or x = (20/9-(484/81)^(1/2))/(1/3*2)
x = 7 or x = -1/3
x in { -1/3, 7 }
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