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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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