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(2*x^2)/3-((15*x^1)/3)-8 = 0
(2*x^2)/3-5*x-8 = 0
2/3*x^2-5*x-8 = 0
DELTA = (-5)^2-(-8*2/3*4)
DELTA = 139/3
DELTA > 0
x = ((139/3)^(1/2)+5)/(2/3*2) or x = (5-(139/3)^(1/2))/(2/3*2)
x = 3/4*((139/3)^(1/2)+5) or x = 3/4*(5-(139/3)^(1/2))
x in { 3/4*(5-(139/3)^(1/2)), 3/4*((139/3)^(1/2)+5) }
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