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Evaluate each of the following without using a calculator.

`log_(1/9)(81) =`  

 `log_(1/6)(-1) =`  

 `log_(1/10)(1) =`  

 `log_(7)(49) =`  

 `log_(5)(5) =`  

 `log_(9)(1/9) =`  

 `log_(8)(2) =`