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x in (-oo:+oo)
2*x^2-3 = 1/8 // - 1/8
2*x^2-(1/8)-3 = 0
2*x^2-1/8-3 = 0
2*x^2 = 25/8 // : 2
x^2 = 25/16
x^2 = 25/16 // ^ 1/2
abs(x) = 5/4
x = 5/4 or x = -5/4
x in { 5/4, -5/4 }
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