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x in (-oo:+oo)
x^2 = 25/324 // - 25/324
x^2-(25/324) = 0
x^2-25/324 = 0
1*x^2 = 25/324 // : 1
x^2 = 25/324
x^2 = 25/324 // ^ 1/2
abs(x) = 5/18
x = 5/18 or x = -5/18
x in { 5/18, -5/18 }
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