$\"\"$ \ \

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The equations are $\"\"$ and $\"\"$ .

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Find the value of $\"\"$ .

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$\"\"$ (First equation) \ \

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

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$\"\"$ (Combine like terms)

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$\"\"$ (Rewrite the equation) \ \

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$\"\"$ (Substitute second equation is $\"\"$ )

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$\"\"$ (Multiply)

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$\"\"$ (Subtact $\"\"$ from each side)

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Divide each side by $\"\"$ )

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$\"\"$ (Cancel common terms)

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

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$\"\"$

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Option D is right choice.