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