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x in (-oo:+oo)
((5*x)/2)*x = 27 // - 27
((5*x)/2)*x-27 = 0
5/2*x^2 = 27 // : 5/2
x^2 = 54/5
x^2 = 54/5 // ^ 1/2
abs(x) = (54/5)^(1/2)
x = (54/5)^(1/2) or x = -(54/5)^(1/2)
x in { (54/5)^(1/2), -(54/5)^(1/2) }
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