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x in (-oo:+oo)
((4*x)/3)*x = 192 // - 192
((4*x)/3)*x-192 = 0
4/3*x^2 = 192 // : 4/3
x^2 = 144
x^2 = 144 // ^ 1/2
abs(x) = 12
x = 12 or x = -12
x in { 12, -12 }
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