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(x^3)/6-(y/2) = -4 // + 4
(x^3)/6-(y/2)+4 = 0
1/6*x^3 = -(4-1/2*y) // : 1/6
x^3 = -6*(4-1/2*y)
x^3 = -6*(4-1/2*y) // ^ 1/3
x = -6^(1/3)*(4-1/2*y)^(1/3)
x = -6^(1/3)*(4-1/2*y)^(1/3)
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