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

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The expression is $\"\"$ .

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$\"\"$ (Commutative property: a + b = b + a)

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$\"\"$ (Distributive property: (b $\"\"$ c) a = ba $\"\"$ ca)

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

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The solution is $\"\"$ .