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

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The expression is $\"\"$ .

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Apply addition property: if $\"\"$

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$\"\"$ (Add 7 to each side) \ \

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$\"\"$ (Additive inverse property: $\"\"$ )

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$\"\"$ (Additive identity property: $\"\"$ )

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

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The value of expression is $\"\"$ .