For what negative value of $k$ is there exactly one solution to the system of equations \begin{align*}
y &= 2x^2 + kx + 6 \\
y &= -x + 4?
\end{align*}
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<|im_start|>user
For what negative value of $k$ is there exactly one solution to the system of equations \begin{align*}
y &= 2x^2 + kx + 6 \\
y &= -x + 4?
\end{align*}
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-5
For what negative value of $k$ is there exactly one solution to the system of equations \begin{align*}
y &= 2x^2 + kx + 6 \\
y &= -x + 4?
\end{align*}
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