Question 19206
F = (9C + 160)/5


First multiply both sides of the equation by 5.  That should yield:
5F = 9C + 160


Next add -160 to both sides.  That should yield:
5F - 160 = 9C


Then, divide both sides by 9.  Do you get?
(5F-160)/9 = C     


I hope that this is the answer in the book.