$\"\"$

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The values of the variables are $\"\"$ and $\"\"$ .

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The expression is $\"\"$ .

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$\"\"$ (Substitute $\"\"$ and $\"\"$ in the expression)

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

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

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

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

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$\"\"$

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