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Y in (-oo:+oo)
Y^2 = 25/36 // - 25/36
Y^2-(25/36) = 0
Y^2-25/36 = 0
1*Y^2 = 25/36 // : 1
Y^2 = 25/36
Y^2 = 25/36 // ^ 1/2
abs(Y) = 5/6
Y = 5/6 or Y = -5/6
Y in { 5/6, -5/6 }
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