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