The fifth term of an arithmetic sequence is 9 and the 32nd term is \(-840\). What is the 23rd term?
From 5th to 32nd is 27 terms ===> 27 of the common d
9 + 27d = - 840
d = - 30 7/9
from 5th to 23rd is 18 d
9 + 18 ( -30 7/9) = -545
+36916 
