x−1/4=81x^{-1/4}=81x−1/4=81
x1/4=1/81x^{1/4}=1/81x1/4=1/81
x=(1/81)4x=(1/81)^4x=(1/81)4
x＝1/43046721x＝1/43046721x＝1/43046721
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