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[tex] {3}^{ - 1} + {3}^{0} - {3}^{1} + {3}^{2} [/tex]
[tex] \frac{1}{3} + 1 - 3 + 9[/tex]
[tex] \frac{1}{3} + 7[/tex]
[tex] \frac{1 + 21}{3} [/tex]
[tex] \frac{22}{3} [/tex]
