4. Find the correct answer

"A point \(R\) lies between two points \(P\) and \(Q\) such that \(PR\) \(=\) \(QR\), then \(2PR\) \(=\)\(PQ\)."
 
If \(QR\) \(=\) 13, find \(PQ\) using the above statement.
 
The value of \(PQ\) \(=\) .
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