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x in (-oo:+oo)
(X/9)*x^4 = 58 // - 58
(X/9)*x^4-58 = 0
1/9*X*x^4 = 58 // : 1/9*X
x^4 = 522*X^-1
x^4 = 522*X^-1 // ^ 1/4
abs(x) = 522^(1/4)*X^(-1/4)
x = 522^(1/4)*X^(-1/4) or x = -(522^(1/4)*X^(-1/4))
x in { 522^(1/4)*X^(-1/4), -(522^(1/4)*X^(-1/4)) }
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