Can you solve these logarithmic equations?

Algebra Level 4

$\large\begin{eqnarray}\begin{split}\log_2a+\log_4b+\log_4c=&\ 2\\\log_3b+\log_9c+\log_9a=&\ 2\\\log_4c+\log_{16}a+\log_{16}b=&\ 2\end{split}\end{eqnarray}$

If $$a$$, $$b$$ and $$c$$ satisfy the above system of equations, find the value of $$6a+8b-3c$$.

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