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y in (-oo:+oo)
y^2 = 81/64 // - 81/64
y^2-(81/64) = 0
y^2-81/64 = 0
1*y^2 = 81/64 // : 1
y^2 = 81/64
y^2 = 81/64 // ^ 1/2
abs(y) = 9/8
y = 9/8 or y = -9/8
y in { 9/8, -9/8 }
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