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