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y in (-oo:+oo)
9*y^2-(121/64) = 0
9*y^2-121/64 = 0
9*y^2 = 121/64 // : 9
y^2 = 121/576
y^2 = 121/576 // ^ 1/2
abs(y) = 11/24
y = 11/24 or y = -11/24
y in { 11/24, -11/24 }
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