Formula for adjacent row sums?

L

lil'bit

Hello. I have a speadsheet that has numerous rows and columns of amounts
that need to have an automatic sum entered in the middle of each row.
For ex:

Inv Date Part Labor Tax Total Other Paid (auto sum) other other
23 1/4 nut 27. 2. 29. -3. 22. ( )
0. 0.
 
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