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x in (-oo:+oo)
x^2 = 40/3 // - 40/3
x^2-(40/3) = 0
x^2-40/3 = 0
1*x^2 = 40/3 // : 1
x^2 = 40/3
x^2 = 40/3 // ^ 1/2
abs(x) = (40/3)^(1/2)
x = (40/3)^(1/2) or x = -(40/3)^(1/2)
x in { (40/3)^(1/2), -(40/3)^(1/2) }
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