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(a)

The equation is $\"\"$ .

Rewrite the above equation as $\"\"$ .

Apply the inverse property of logarithmic function : $\"\"$ .

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(b).

The equation is $\"\"$ .

Rewrite the above equation as $\"\"$ .

Apply the inverse property of logarithmic function: $\"\"$ .

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(a). The value of $\"\"$ or $\"\"$ .

(b). The value of $\"\"$ .