Answer
$log_6(3)\approx0.613$
Work Step by Step
Step 1. Let $u=6^x$, we have $u^2-6u+9=0 \longrightarrow (u-3)^2=0 \longrightarrow u=3$
Step 2. For $6^x=3$, we have $x=log_6(3)\approx0.613$
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