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y in (-oo:+oo)
y^2 = 25/81 // - 25/81
y^2-(25/81) = 0
y^2-25/81 = 0
1*y^2 = 25/81 // : 1
y^2 = 25/81
y^2 = 25/81 // ^ 1/2
abs(y) = 5/9
y = 5/9 or y = -5/9
y in { 5/9, -5/9 }
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