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y in (-oo:+oo)
(y^2)/5+y^2-12 = 0
6/5*y^2 = 12 // : 6/5
y^2 = 10
y^2 = 10 // ^ 1/2
abs(y) = 10^(1/2)
y = 10^(1/2) or y = -10^(1/2)
y in { 10^(1/2), -10^(1/2) }
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