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x in (-oo:+oo)
(5*x^4)/1+8 = 88 // - 88
(5*x^4)/1-88+8 = 0
5*x^4-88+8 = 0
5*x^4 = 80 // : 5
x^4 = 16
x^4 = 16 // ^ 1/4
abs(x) = 2
x = 2 or x = -2
x in { 2, -2 }
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