$\"\"$

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The expression is $\"\"$

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$\"\"$ (Assosiative property: a + (b + c) = (a + b) + c) \ \

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$\"\"$ (Add: $\"\"$ )

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$\"\"$ (Add: $\"\"$ )

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$\"\"$ (Add: $\"\"$ )

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$\"\"$

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The value is of the expression is 36.