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y in (-oo:+oo)
y^2 = 11/2 // - 11/2
y^2-(11/2) = 0
y^2-11/2 = 0
1*y^2 = 11/2 // : 1
y^2 = 11/2
y^2 = 11/2 // ^ 1/2
abs(y) = (11/2)^(1/2)
y = (11/2)^(1/2) or y = -(11/2)^(1/2)
y in { (11/2)^(1/2), -(11/2)^(1/2) }
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