Answer:
12.
[tex]x = \frac{PQ-14}{3}[/tex] and [tex]x = \frac{QR + 10}{7}[/tex]
Step-by-step explanation:
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x = 6
If PQ = 3x + 14, QR = 7x - 10, and Q is the midpoint of PR, then PQ = QR.
[tex]PQ = 3x + 14 = QR = 7x - 10\\3x + 14 = 7x - 10\\3x + 24 = 7x\\24 = 4x\\6 = x\\x = 6[/tex]
