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x in (-oo:+oo)
(9/3)*((6*x^4)/8) = x // - x
(9/3)*((6*x^4)/8)-x = 0
9/4*x^4-x = 0
x*(9/4*x^3-1) = 0
9/4*x^3 = 1 // : 9/4
x^3 = 4/9
x^3 = 4/9 // ^ 1/3
x = (4/9)^(1/3)
x = 0
x = 0
x in { (4/9)^(1/3), 0 }
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