$\"\"$

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The equation is $\"\"$ .

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Apply Property of equality for logarithmic functions: $\"\"$ .

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$\"\"$

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Add 21 to each side.

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$\"\"$

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$\"\"$ $\"\"$

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Factors of left side: $\"\"$ .

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$\"\"$

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Apply zero product property: ab =0 then a = 0 or b = 0.

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$\"\"$

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$\"\"$ $\"\"$

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CHECK:-

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To check the solution, substitute $\"\"$ it satisfies the inequality $\"\"$ .

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$\"\"$

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Evaluate power: $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ $\"\"$

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CHECK:-

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To check the solution, substitute $\"\"$ it satisfies the inequality $\"\"$ .

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$\"\"$

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Evaluate power: $\"\"$ .

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$\"\"$

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$\"\"$

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The check solutions are true. $\"\"$

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The solutions are $\"\"$ .