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log in baza 3(x+5)=log in baza 3 din 9

Răspuns :

 

[tex]\displaystyle\bf\\log_3(x+5)=log_3(9)\\\\Avem~ aceeasi~ baza.\\\\\implies~x+5=9\\\\\implies~x=9-5\\\\\implies~\boxed{\bf x=4}[/tex]