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y in (-oo:+oo)
(4*y^2)/3 = 27 // - 27
(4*y^2)/3-27 = 0
4/3*y^2 = 27 // : 4/3
y^2 = 81/4
y^2 = 81/4 // ^ 1/2
abs(y) = 9/2
y = 9/2 or y = -9/2
y in { 9/2, -9/2 }
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