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x in (-oo:+oo)
(3/4)*x^4 = 22 // - 22
(3/4)*x^4-22 = 0
3/4*x^4 = 22 // : 3/4
x^4 = 88/3
x^4 = 88/3 // ^ 1/4
abs(x) = (88/3)^(1/4)
x = (88/3)^(1/4) or x = -(88/3)^(1/4)
x in { (88/3)^(1/4), -(88/3)^(1/4) }
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