For step #6, you'll want to take the difference of #3 - #2 - #1 and use that value in step #7.
For step #14, you'll want to take the difference of #11- #10 -#9 and use that value in step # 15.
Just to confirm, you're not subtracting the values in Steps #6 or #14 from the previous steps, you're just calculating the value to use in the next steps (7 and 15, respectively).
For step #14, you'll want to take the difference of #11- #10 -#9 and use that value in step # 15.
Just to confirm, you're not subtracting the values in Steps #6 or #14 from the previous steps, you're just calculating the value to use in the next steps (7 and 15, respectively).