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y in (-oo:+oo)
y^2 = 100/36 // - 100/36
y^2-(100/36) = 0
y^2-25/9 = 0
1*y^2 = 25/9 // : 1
y^2 = 25/9
y^2 = 25/9 // ^ 1/2
abs(y) = 5/3
y = 5/3 or y = -5/3
y in { 5/3, -5/3 }
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