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8. ๊ณก์„  \( y = x^2 - 5x \)์™€ ์ง์„  \( y = x \)๋กœ ๋‘˜๋Ÿฌ์‹ธ์ธ ๋ถ€๋ถ„์˜ ๋„“์ด๋ฅผ ์ง์„  \( x = k \)๊ฐ€ ์ด๋“ฑ๋ถ„ํ•  ๋•Œ, ์ƒ์ˆ˜ \( k \)์˜ ๊ฐ’์€? [3์ ]

\begin{itemize}
    \item[1] \( 3 \)
    \item[2] \( \frac{13}{4} \)
    \item[3] \( \frac{7}{2} \)
    \item[4] \( \frac{15}{4} \)
    \item[5] \( 4 \)
\end{itemize}