Help with Armhole and neck scoop.

Hi I’m working on a scoopneck pattern. I’ve divided tbe scoop. I’m confused with the following instructions and not sure how to proceed. * Work 4 more decreases at armhole edge on right side of work and at the same time cast off 3 sts twice, then 2 sts three times at scoop edge. Work even on these 10 sts until armhole measures 7 1/2 inches, from beginning of armhole shaping ending with the right side facing. Cast off. Please provide me with simple step by step instructions. Thank you.

Welcome to the forum!
Decrease at the armhole on RS (right side) rows 1,3,5,7. On the neck edge bind off 3 sts on row 2, 3sts on row 4, 2sts on row 6, 2sts on row 8 and 2sts on row 10. You’ll be decreasing at the beginning of the RS rows (maybe a knit row) and binding off sts at the beginning of the WS (wrong side) rows (maybe a purl row).
What is the name of your pattern?

It’s an old 80s pattern Bouquet Cotten Look Cindy 727 scoopneck suntop that I started and never finished.

Good for you for finishing up this project. Sounds lovely.
If you’ve never worked a sloped bind off this is a nice way to avoid the stair step that the usual bind gives you.

How many stitches do I decrease on rows 1 through 7 ?