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x in (-oo:+oo)
y = (3/4)*x^3 // - (3/4)*x^3
y-((3/4)*x^3) = 0
(-3/4)*x^3+y = 0
-3/4*x^3 = -y // : -3/4
x^3 = 4/3*y
x^3 = 4/3*y // ^ 1/3
x = (4/3)^(1/3)*y^(1/3)
x = (4/3)^(1/3)*y^(1/3)
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