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y in (-oo:+oo)
y^2 = 16/64 // - 16/64
y^2-(16/64) = 0
y^2-1/4 = 0
1*y^2 = 1/4 // : 1
y^2 = 1/4
y^2 = 1/4 // ^ 1/2
abs(y) = 1/2
y = 1/2 or y = -1/2
y in { 1/2, -1/2 }
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