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x in (-oo:+oo)
((4*x)/3)*x = 432 // - 432
((4*x)/3)*x-432 = 0
4/3*x^2 = 432 // : 4/3
x^2 = 324
x^2 = 324 // ^ 1/2
abs(x) = 18
x = 18 or x = -18
x in { 18, -18 }
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