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y in (-oo:+oo)
y*y*y = 27/512 // - 27/512
y*y*y-(27/512) = 0
y*y*y-27/512 = 0
1*y^3 = 27/512 // : 1
y^3 = 27/512
y^3 = 27/512 // ^ 1/3
y = 3/8
y = 3/8
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