Equação com expoentes?

x = ( - 1 / 3) + [ 3^-1 - ( - 3)^-1]^- 2

Encontrei x = 79 / 54 mas no gabarito ta 239 / 108 e essas frações nao sao equivalentes.

Update:

Desculpe, errei ao digitar a questão: x = ( - 1 / 3)^3 + [ 3^-1 - ( - 3)^-1]^- 2

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