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x in (-oo:+oo)
(4*x^2)/3-5 = 103 // - 103
(4*x^2)/3-103-5 = 0
4/3*x^2 = 108 // : 4/3
x^2 = 81
x^2 = 81 // ^ 1/2
abs(x) = 9
x = 9 or x = -9
x in { 9, -9 }
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