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x in (-oo:+oo)
5^4-x = 1/625 // - 1/625
5^4-x-(1/625) = 0
5^4-x-1/625 = 0
390624/625-x = 0 // - 390624/625
-x = -390624/625 // * -1
x = 390624/625
x = 390624/625
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