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y in (-oo:+oo)
y^2 = 4/81 // - 4/81
y^2-(4/81) = 0
y^2-4/81 = 0
1*y^2 = 4/81 // : 1
y^2 = 4/81
y^2 = 4/81 // ^ 1/2
abs(y) = 2/9
y = 2/9 or y = -2/9
y in { 2/9, -2/9 }
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