Rewrite as .

Logarithm base of is .

Logarithm base of is .

Multiply by .

Subtract from .

Expand log base 7 of 1/343

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# Expand log base 7 of 1/343

Rewrite as .

Logarithm base of is .

Logarithm base of is .

Multiply by .

Subtract from .

Expand log base 7 of 1/343