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y in (-oo:+oo)
5/9 = y^3 // - y^3
5/9-y^3 = 0
-1*y^3 = -5/9 // : -1
y^3 = 5/9
y^3 = 5/9 // ^ 1/3
y = (5/9)^(1/3)
y = (5/9)^(1/3)
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