Rewrite as .

Rewrite as .

Logarithm base of is .

Subtract from .

Rewrite as .

Expand by moving outside the logarithm.

Multiply by .

Expand log of (1/9)/k

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# Expand log of (1/9)/k

Rewrite as .

Rewrite as .

Logarithm base of is .

Subtract from .

Rewrite as .

Expand by moving outside the logarithm.

Multiply by .

Expand log of (1/9)/k