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x in (-oo:+oo)
(x^4)/7 = 4096 // - 4096
(x^4)/7-4096 = 0
1/7*x^4 = 4096 // : 1/7
x^4 = 28672
x^4 = 28672 // ^ 1/4
abs(x) = 8*7^(1/4)
x = 8*7^(1/4) or x = -(8*7^(1/4))
x in { 8*7^(1/4), -(8*7^(1/4)) }
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