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(8*x^2)/3-((15*x^1)/3)-2 = 0
(8*x^2)/3-5*x-2 = 0
8/3*x^2-5*x-2 = 0
DELTA = (-5)^2-(-2*8/3*4)
DELTA = 139/3
DELTA > 0
x = ((139/3)^(1/2)+5)/(2*8/3) or x = (5-(139/3)^(1/2))/(2*8/3)
x = 3/16*((139/3)^(1/2)+5) or x = 3/16*(5-(139/3)^(1/2))
x in { 3/16*(5-(139/3)^(1/2)), 3/16*((139/3)^(1/2)+5) }
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