By: Queda

I am trying to add and subtract across an Excel spreadsheet, ex. add cells B1, D1, F1 and then subtract the sum of cells C1, E1, G1. I thought I had it figured out, but . . . . this is what I came up with, but no go. I may be making this too hard! I can add columns, but can I not add across?
=SUM(B71,D71,F71,H71,J71,L71,N71,P71,R71)-SUM(C71,E71,G71,I71,K71,M71,O71,Q71,S71)