Trong không gian với hệ tọa độ $Oxyz,$ cho hai vectơ $\overrightarrow{a}=\left(1;2;1\right)$ và $\overrightarrow{b}=\left(x;1-x;2\right).$ Tìm tập hợp tất cả các giá trị của $x$ để $\left|\overrightarrow{a}+\overrightarrow{b}\right|=5.$

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