Answer :
x - one number
x-17 - other umber
[tex]x+x-17=129\\ 2x=146\\ \boxed{x=73}\\ \boxed{x-17=56} [/tex]
x-17 - other umber
[tex]x+x-17=129\\ 2x=146\\ \boxed{x=73}\\ \boxed{x-17=56} [/tex]