pq = 7x, qr = x + 1, and pr = 9, what is qr

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pq = 7x, qr = x + 1, and pr = 9, what is qr

PQ + QR = PR
7x + x + 1 = 9

Using our equation solver, we get:
x = 1

Plug in x = 1 to QR:
1 + 1 = 2