Point S is on line segment
�
�
‾
RT
. Given
�
�
=
�
+
5
,
RT=x+5,
�
�
=
4
�
−
9
,
ST=4x−9, and
�
�
=
�
−
2
,
RS=x−2, determine the numerical length of
�
�
‾
.
RT
.