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y in (-oo:+oo)
y^(2/3)-216 = 0
1*y^(2/3) = 216 // : 1
y^(2/3) = 216
y^(2/3) = 216 // ^ 3
y^2 = 10077696 // ^ 1/2
abs(y) = 1296*6^(1/2)
y = 1296*6^(1/2) or y = -(1296*6^(1/2))
y in { 1296*6^(1/2), -(1296*6^(1/2)) }
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