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(5/11)^3 = 625*x // - 625*x
(5/11)^3-(625*x) = 0
(5/11)^3-625*x = 0
125/1331-625*x = 0 // - 125/1331
-625*x = -125/1331 // : -625
x = -125/1331/(-625)
x = 1/6655
x = 1/6655
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