$\"\"$

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The equation is $\"\"$

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Adding k terms .

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$\"\"$

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Divide each side by 8

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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 $\"\"$ in original equation.

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$\"\"$

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$\"\"$

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$\"\"$

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The solution is true. $\"\"$

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The value of $\"\"$ .