$\"\"$

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The values are $\"\"$ .

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Apply sum of an arithmetic series formula: $\"\"$ .

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ ) $\"\"$

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Apply multiplication property of equality: a = b then $\"\"$

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$\"\"$ (Multiply each side by 2)

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$\"\"$ (Cancel common term)

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Distribute terms using distributive property: a (b + c) = ab + ac.

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$\"\"$

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ ) $\"\"$

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Apply subtraction property of equality: a = b then $\"\"$

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$\"\"$ (Subtract 2736 from each side)

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$\"\"$ (Subtract: $\"\"$ )

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Apply division property of equality: a = b then $\"\"$ .

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$\"\"$ (Divide each side by 38)

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$\"\"$ (Cancel common term)

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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The value of $\"\"$ .