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y in (-oo:+oo)
y^(2/3) = 4 // - 4
y^(2/3)-4 = 0
1*y^(2/3) = 4 // : 1
y^(2/3) = 4
y^(2/3) = 4 // ^ 3
y^2 = 64 // ^ 1/2
abs(y) = 8
y = 8 or y = -8
y in { 8, -8 }
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