$\"\"$

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The arithmetic progression $\"\"$ .

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Solve for $\"\"$ .

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Consider $\"\"$ .

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Multiply each side 2.

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$\"\"$

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Cancel common terms.

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$\"\"$ \ \

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Divide each side by n.

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$\"\"$

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Cancel common terms.

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$\"\"$

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Subtract $\"\"$ from each side.

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$\"\"$

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$\"\"$

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The L.C.M of $\"\"$ and 1 is $\"\"$ .

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$\"\"$ \ \ Divide each side by 2.

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$\"\"$

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Cancel common terms.

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$\"\"$ . $\"\"$

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The value of $\"\"$ .