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(a)

The equation is $\"\"$ .

Property of natural logarithm: $\"\"$ .

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$\"\"$ .

The solution of the equation $\"\"$ is $\"\"$ .

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(b)

The equation is $\"\"$ .

Defintion of the logarithm function with base $\"\"$ : $\"\"$ .

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Change of base formula : $\"\"$ .

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$\"\"$ .

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(a) The solution of the equation $\"\"$ is $\"\"$ .

(b) The solution of the equation $\"\"$ is $\"\"$ .