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y in (-oo:+oo)
(5/2)*y*y = 360 // - 360
(5/2)*y*y-360 = 0
5/2*y^2 = 360 // : 5/2
y^2 = 144
y^2 = 144 // ^ 1/2
abs(y) = 12
y = 12 or y = -12
y in { 12, -12 }
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