lace and cables question

hi i am working on a sweater (the back) and 12 rows consist of the pattern to work even for 14" but each 12 rows i work, i’ve decreased so i am confused what they mean. here is the language they use:

1st row: (RS). K1. *K6. yfwd. Sl1. K1.
psso. K1. K2tog. yfwd. Rep from * to
last 7 sts. K7.
2nd and alt rows: Purl.
3rd row: K1. *K7. yfwd. Sl1. K2tog.
psso. yfwd. K1. Rep from * to last
7 sts. K7.
5th row: As 1st row.
7th row: As 3rd row.
9th row: As 1st row.
11th row: K1. *C6F. K1. yfwd. Sl1.
K2tog. psso. yfwd. K1. Rep from * to
last 7 sts. C6F. K1.
12th row: As 2nd row.

These 12 rows form pat.

Cont even in pat until work from beg
measures 14 ins [35.5 cm], ending
with a WS row.

Thanks to all for your help.

In the lace rows, each decrease or double decrease is accompanied by a yfwd (yarn forward). These yfwd’s are yarn overs and thus, increases. They will balance out the decreases.
For the yfwd bring the yarn to the front between the needles and then over the right needle to the back. You’re then ready for the next stitch, the S1, K2tog or a K1.

Your reply has been very helpful! Thank you very much!