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3*((-20*y)/3) = 3*(30/5)*x^3 // - 3*(30/5)*x^3
3*((-20*y)/3)-(3*(30/5)*x^3) = 0
3*((-20*y)/3)-18*x^3 = 0
-18*x^3 = -(-20*y) // : -18
x^3 = (-10*y)/9
x^3 = (-10*y)/9 // ^ 1/3
x = (-10^(1/3)*y^(1/3))/(9^(1/3))
x = (-10^(1/3)*y^(1/3))/(9^(1/3))
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