실수 $\alpha$, $\beta$가 다음 방정식을 만족할 때, $\alpha+\beta$를 구하여라. \begin{align*} \alpha^3 – 3\alpha^2 + 5\alpha – 17 &= 0 \\ \beta^3 – 3\beta^2 + 5\beta + 11 &= 0 \end{align*}
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실수 $\alpha$, $\beta$가 다음 방정식을 만족할 때, $\alpha+\beta$를 구하여라. \begin{align*} \alpha^3 – 3\alpha^2 + 5\alpha – 17 &= 0 \\ \beta^3 – 3\beta^2 + 5\beta + 11 &= 0 \end{align*}