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8*y-(x*((16*x^2)/8)) = 0
8*y-2*x^3 = 0
-2*x^3 = -(8*y) // : -2
x^3 = 4*y
x^3 = 4*y // ^ 1/3
x = 4^(1/3)*y^(1/3)
x = 4^(1/3)*y^(1/3)
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