UPSKILL MATH PLUS

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Determine the value \(QR\) of the triangle \(PQR\) if \(QS =\) 40\(x +\) 3 feet and \(SR =\) 39\(x +\) 19 feet and \(S\) is the midpoint of \(QR\).
 
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Length of the \(QR\) is  feet.