7. Find the side length of the triangle

Answer variants:
0.93
1.93
−0.07
−1.07
In \(\triangle ABC\), \(D\) and \(E\) are points of the sides \(AB\) and \(AC\), respectively. If \(DE \parallel BC\), \(AD = 3 \ cm\), \(DB = 7 \ cm\) and \(AC = 3.1 \ cm\), then find \(AE\).
 
12.svg
 
The value of \(AE\) is
 \(cm\).
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