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x in (-oo:+oo)
y = (11/3)*x^3 // - (11/3)*x^3
y-((11/3)*x^3) = 0
(-11/3)*x^3+y = 0
-11/3*x^3 = -y // : -11/3
x^3 = 3/11*y
x^3 = 3/11*y // ^ 1/3
x = (3/11)^(1/3)*y^(1/3)
x = (3/11)^(1/3)*y^(1/3)
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