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x in (-oo:+oo)
((3*x)/3)*x-5 = 1/2 // - 1/2
((3*x)/3)*x-(1/2)-5 = 0
((3*x)/3)*x-1/2-5 = 0
1*x^2 = 11/2 // : 1
x^2 = 11/2
x^2 = 11/2 // ^ 1/2
abs(x) = (11/2)^(1/2)
x = (11/2)^(1/2) or x = -(11/2)^(1/2)
x in { (11/2)^(1/2), -(11/2)^(1/2) }
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