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x in (-oo:+oo)
((3*x)/2)*x = 10 // - 10
((3*x)/2)*x-10 = 0
3/2*x^2 = 10 // : 3/2
x^2 = 20/3
x^2 = 20/3 // ^ 1/2
abs(x) = (20/3)^(1/2)
x = (20/3)^(1/2) or x = -(20/3)^(1/2)
x in { (20/3)^(1/2), -(20/3)^(1/2) }
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