simple pattern question

My pattern reads Shoulders cast off both sides every other row 3X7sts + 5X8 sts. Does this mean to do 3 X 7sts and then do 5 X 8 sts?

Yes, it’s 3 times 7sts and 5 times 8sts but remember that it’s on both sides of the piece. Since you can’t easily bind off at the end of the row, you’ll turn and bind off at the beginning of the next row. That means that effectively, you bind off 7sts at the beginning of the next 6 rows and 8sts at the beginning of the next 10 rows. Does that make sense with your stitch count?
Which pattern are you making?

Yes. I am making a pullover pattern from Lang. Its european translated.
Thanks for your help again.