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x in (-oo:+oo)
6^8-x = 1/216 // - 1/216
6^8-x-(1/216) = 0
6^8-x-1/216 = 0
362797055/216-x = 0 // - 362797055/216
-x = -362797055/216 // * -1
x = 362797055/216
x = 362797055/216
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