Question 244987
It turns out that {{{a^log(a,(b))=log(a,(a^b))=b}}}. In this problem, it's useful to know {{{a^log(a,(b))=b}}}. 



In this case, a=12 and b=5. So {{{x=12^(log(12,(5)))=5}}} which means that the answer is {{{x=5}}}