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y in (-oo:+oo)
(y^2)/3-49 = 0
1/3*y^2 = 49 // : 1/3
y^2 = 147
y^2 = 147 // ^ 1/2
abs(y) = 7*3^(1/2)
y = 7*3^(1/2) or y = -(7*3^(1/2))
y in { 7*3^(1/2), -(7*3^(1/2)) }
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