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x in (-oo:+oo)
(13/11)^4-x = 11/13 // - 11/13
(13/11)^4-x-(11/13) = 0
(13/11)^4-x-11/13 = 0
210242/190333-x = 0 // - 210242/190333
-x = -210242/190333 // * -1
x = 210242/190333
x = 210242/190333
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