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In the diagram below of triangle
P
Q
R
PQR,
S
S is the midpoint of
P
R

PR
and
T
T is the midpoint of
Q
R

QR

. If
S
T
=

22
+
9
x
ST=−22+9x, and
P
Q
=
9
x

8
PQ=9x−8, what is the measure of
P
Q

PQ

?