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y in (-oo:+oo)
y^3-((8*y^3)/2) = 64 // - 64
y^3-((8*y^3)/2)-64 = 0
y^3-4*y^3-64 = 0
-3*y^3 = 64 // : -3
y^3 = -64/3
y^3 = -64/3 // ^ 1/3
y = -(64/3)^(1/3)
y = -(64/3)^(1/3)
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