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Exponentialgleichungen: 8^(x-9)= 4^x

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- Was mache ich falsch?

8^(x-9)= 4^x 

(x-9) log 8 = x log 4 

x log 8 - 9 log 8 = x log 4 /-x log 8 

-9 log 8 = x log 4 - x log 8 

-9 log 8 = x (log 4- log 8) 

-9 log 8 / (log 4 - log 8) = x 

Bekomme aber die falsche Lösung raus? Was mache ich falsch? 

DANKE


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