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y in (-oo:+oo)
y^2 = 63/64 // - 63/64
y^2-(63/64) = 0
y^2-63/64 = 0
1*y^2 = 63/64 // : 1
y^2 = 63/64
y^2 = 63/64 // ^ 1/2
abs(y) = (63/64)^(1/2)
y = (63/64)^(1/2) or y = -(63/64)^(1/2)
y in { (63/64)^(1/2), -(63/64)^(1/2) }
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