Use the rule  on the left side:



What the log is taken of on the left side must equal to
what the log is taken of on the right side.



Multiply both sides by 













       
         

The negative solution must be discarded
because it cannot be substituted in the 
term on the right of the original equation,
 for the log of a negative
number is not a real number.

Therefore the only solution is 

Edwin