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X in (-oo:+oo)
X^2-(9/16) = 0
X^2-9/16 = 0
1*X^2 = 9/16 // : 1
X^2 = 9/16
X^2 = 9/16 // ^ 1/2
abs(X) = 3/4
X = 3/4 or X = -3/4
X in { 3/4, -3/4 }
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