How do I simplify this expression to a single logarithm involving two -log?

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I have to find x in this equation. This is my first time encountering an expression with two -logs so I don't know which one goes in the denominator. The expression is:

$$\log_7(x+6) - \log_7(x-9) - \log_7(4) = 0$$

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Hint:

$\log_7(a) - \log_7(b)=\log_7\left(\frac ab\right)$