A triangle has side lengths of (
9.7
c
−
9.4
d
)
(9.7c−9.4d) centimeters,
(
9.5
c
+
5.7
f
)
(9.5c+5.7f) centimeters, and
(
6.1
f
−
7.5
d
)
(6.1f−7.5d) centimeters. Which expression represents the perimeter, in centimeters, of the triangle?