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x in (-oo:+oo)
(3/4)*x^2 = 48 // - 48
(3/4)*x^2-48 = 0
3/4*x^2 = 48 // : 3/4
x^2 = 64
x^2 = 64 // ^ 1/2
abs(x) = 8
x = 8 or x = -8
x in { 8, -8 }
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