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y in (-oo:+oo)
(y^2)/4-3 = 0
1/4*y^2 = 3 // : 1/4
y^2 = 12
y^2 = 12 // ^ 1/2
abs(y) = 2*3^(1/2)
y = 2*3^(1/2) or y = -(2*3^(1/2))
y in { 2*3^(1/2), -(2*3^(1/2)) }
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