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y in (-oo:+oo)
y^2 = (225^1)/2 // - (225^1)/2
y^2-((225^1)/2) = 0
y^2-225/2 = 0
1*y^2 = 225/2 // : 1
y^2 = 225/2
y^2 = 225/2 // ^ 1/2
abs(y) = (225/2)^(1/2)
y = (225/2)^(1/2) or y = -(225/2)^(1/2)
y in { (225/2)^(1/2), -(225/2)^(1/2) }
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