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1/216 = 6^3*x-4 // - 6^3*x-4
1/216-(6^3*x)+4 = 0
865/216-216*x = 0 // - 865/216
-216*x = -865/216 // : -216
x = -865/216/(-216)
x = 865/46656
x = 865/46656
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