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x in (-oo:+oo)
8/3 = ((2*x)/3)*x-5 // - ((2*x)/3)*x-5
8/3-(((2*x)/3)*x)+5 = 0
(-2/3)*x^2+8/3+5 = 0
-2/3*x^2 = -23/3 // : -2/3
x^2 = 23/2
x^2 = 23/2 // ^ 1/2
abs(x) = (23/2)^(1/2)
x = (23/2)^(1/2) or x = -(23/2)^(1/2)
x in { (23/2)^(1/2), -(23/2)^(1/2) }
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