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y in (-oo:+oo)
9/4-((y^2)/5) = 1 // - 1
9/4-((y^2)/5)-1 = 0
-1/5*y^2 = -5/4 // : -1/5
y^2 = 25/4
y^2 = 25/4 // ^ 1/2
abs(y) = 5/2
y = 5/2 or y = -5/2
y in { 5/2, -5/2 }
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