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Y in (-oo:+oo)
Y^(2/3) = 64 // - 64
Y^(2/3)-64 = 0
1*Y^(2/3) = 64 // : 1
Y^(2/3) = 64
Y^(2/3) = 64 // ^ 3
Y^2 = 262144 // ^ 1/2
abs(Y) = 512
Y = 512 or Y = -512
Y in { 512, -512 }
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