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y in (-oo:+oo)
4*y^2 = 48/3 // - 48/3
4*y^2-(48/3) = 0
4*y^2-16 = 0
4*y^2 = 16 // : 4
y^2 = 4
y^2 = 4 // ^ 1/2
abs(y) = 2
y = 2 or y = -2
y in { 2, -2 }
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