Rewrite as .

The natural logarithm of is .

Rewrite as .

The natural logarithm of is .

Rewrite as .

Rewrite as .

Rewrite as .

Rewrite as .

Apply the distributive property.

Subtract from .

Subtract from .

Add and .

Add and .

Add and .

Add and .

Add and .

Expand natural log of 6e- natural log of 42+ natural log of 7e