2. Find the side length of the triangle

Answer variants:
2.829
1.829
0.829
3.829
In \(\triangle ABC\), \(D\) and \(E\) are points of the sides \(AB\) and \(AC\), respectively. If \(DE \parallel BC\), \(\frac{AD}{DB} = \frac{2}{5}\) and \(AC = 9.9 \ cm\), then find \(AE\).
 
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The value of \(AE\) is
 \(cm\).
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