2. Даны векторы \(\overrightarrow{c}\)\((3;-1)\) и \(\overrightarrow{d}\)\((4,5;1,5)\). Найди длину вектора \(3\) \(⋅ \) \(\overrightarrow{c}\)\(-\) \(2\) \(⋅ \) \(\overrightarrow{d}\).

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