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x in (-oo:+oo)
x*((x*((((6*x)/2)*x)/9))/3) = 1 // - 1
x*((x*((((6*x)/2)*x)/9))/3)-1 = 0
1/9*x^4 = 1 // : 1/9
x^4 = 9
x^4 = 9 // ^ 1/4
abs(x) = 9^(1/4)
x = 9^(1/4) or x = -9^(1/4)
x in { 9^(1/4), -9^(1/4) }
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