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y in (-oo:+oo)
8/3 = ((6*y)/0.6)*y // - ((6*y)/0.6)*y
8/3-(((6*y)/0.6)*y) = 0
8/3-10*y^2 = 0
-10*y^2 = -8/3 // : -10
y^2 = 4/15
y^2 = 4/15 // ^ 1/2
abs(y) = (4/15)^(1/2)
y = (4/15)^(1/2) or y = -(4/15)^(1/2)
y in { (4/15)^(1/2), -(4/15)^(1/2) }
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