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(8*x^2)/3 = 2*x+3 // - 2*x+3
(8*x^2)/3-(2*x)-3 = 0
(8*x^2)/3-2*x-3 = 0
8/3*x^2-2*x-3 = 0
DELTA = (-2)^2-(-3*8/3*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)+2)/(2*8/3) or x = (2-36^(1/2))/(2*8/3)
x = 3/2 or x = -3/4
x in { -3/4, 3/2 }
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