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y in (-oo:+oo)
y^(2/3) = 1/16 // - 1/16
y^(2/3)-(1/16) = 0
y^(2/3)-1/16 = 0
1*y^(2/3) = 1/16 // : 1
y^(2/3) = 1/16
y^(2/3) = 1/16 // ^ 3
y^2 = 1/4096 // ^ 1/2
abs(y) = 1/64
y = 1/64 or y = -1/64
y in { 1/64, -1/64 }
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