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x in (-oo:+oo)
((32*x)/3)*x = 18 // - 18
((32*x)/3)*x-18 = 0
32/3*x^2 = 18 // : 32/3
x^2 = 27/16
x^2 = 27/16 // ^ 1/2
abs(x) = (27/16)^(1/2)
x = (27/16)^(1/2) or x = -(27/16)^(1/2)
x in { (27/16)^(1/2), -(27/16)^(1/2) }
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