$\"\"$

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The equation is $\"\"$ .

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$\"\"$ (Subtract 13 from each side)

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$\"\"$ (Divide each side by 8)

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$\"\"$ (Take log (base 4) of each side)

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$\"\"$ (Apply inverse property: $\"\"$ ) $\"\"$

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$\"\"$ (Change-of-base formula: $\"\"$ )

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$\"\"$

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$\"\"$ (Subtract 6 from each side)

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$\"\"$ (Divide each side by negative 2)

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$\"\"$

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$\"\"$ .

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$\"\"$

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The solution of $\"\"$ .