Answer
$8=\log_6{(a+1)}$
Work Step by Step
Take the log base $6$ of both sides:
$$\log_6{\left(6^8\right)}=\log_6{(a+1)}$$
Use the rule $\log_a{\left(a^x\right)}=x$ to obtain
$$8=\log_6{(a+1)}$$
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