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x in (-oo:+oo)
X/6 = 4*x^3-(1/9) // - 4*x^3-(1/9)
X/6-(4*x^3)+1/9 = 0
X/6-4*x^3+1/9 = 0
-4*x^3 = -(1/6*X+1/9) // : -4
x^3 = (1/6*X+1/9)/4
x^3 = (1/6*X+1/9)/4 // ^ 1/3
x = ((1/6*X+1/9)^(1/3))/(4^(1/3))
x = ((1/6*X+1/9)^(1/3))/(4^(1/3))
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