Q is the midpoint of segment PR. What are PQ, QR and PR?
PQ = 6x - 7
QR = 5x + 1
PQ = QR,
6x - 7 = 5x + 1,
x = 8,
PQ = QR = 5×8 + 1 = 41,
PR = 41×2 = 82.
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