Resolver ((3 ^ - 7) / (3 ^ - 9)) * 3 ^ - 4 | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$(3^{-7}\div3^{-9})\times3^{-4}$$