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x in (-oo:+oo)
(3*x^2)/4 = 27 // - 27
(3*x^2)/4-27 = 0
3/4*x^2 = 27 // : 3/4
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in { 6, -6 }
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