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6*Y^2+14*x^3+7/6 = 0
14*x^3 = -(6*Y^2+7/6) // : 14
x^3 = (-(6*Y^2+7/6))/14
x^3 = (-(6*Y^2+7/6))/14 // ^ 1/3
x = (-(6*Y^2+7/6)^(1/3))/(14^(1/3))
x = (-(6*Y^2+7/6)^(1/3))/(14^(1/3))
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