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$\begin{cases} Cx-\cfrac { y }{ 8 } =2+x \\\ 3x-\cfrac { y }{4 } = 1 \end{cases}$

In the system of equations shown above, the $x$-value of the solution is $\cfrac { 1 }{ 2 }$. Find the value of the constant $C$ in this system.

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A

$\cfrac { 1 }{ 2 }$

B

$-2$

C

$-\cfrac { 5 }{ 2 }$

D

$\cfrac { 11 }{ 2 }$

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