$\"\"$

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The expression is $\"\"$ .

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The values are $\"\"$ and $\"\"$ .

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Simplify the expression.

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$\"\"$ (Original expression)

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

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

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$\"\"$ .

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Therefore, the simplified value is $\"\"$ .

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$\"\"$

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The solution is $\"\"$ .