Question 1100960
{{{x=log(b,a)}}} and {{{y=log(b,c)}}}
{{{log(b,(3a/c^4))=log(b,3)+log(b,a)-log(b,c^4)=log(b,3)+x-4log(b,c)=log(b,3)}}}{{{"+"}}}{{{x-4y}}}