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y in (-oo:+oo)
y^2 = 25/64 // - 25/64
y^2-(25/64) = 0
y^2-25/64 = 0
1*y^2 = 25/64 // : 1
y^2 = 25/64
y^2 = 25/64 // ^ 1/2
abs(y) = 5/8
y = 5/8 or y = -5/8
y in { 5/8, -5/8 }
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