Shape front slope

I feel I’m a confident knitter but really need the below in English
Dec 1st at end of next and (7) foll 6th rows. Then on (9) foll 8th rows ?
Hellllpppp

Welcome to the forum!
I know the feeling.
If you call the next row, row 1 then you would decrease at the end of rows 1,7,13,19,25,31, 37 and 43. Then dec at the end of row 51,59,67,75,83,91,99,107 and115