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y in (-oo:+oo)
y^2-(1/9) = 0
y^2-1/9 = 0
1*y^2 = 1/9 // : 1
y^2 = 1/9
y^2 = 1/9 // ^ 1/2
abs(y) = 1/3
y = 1/3 or y = -1/3
y in { 1/3, -1/3 }
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