Not unless you change the meanings of the symbols around, i.e. mix bases as another has done, or simply reassign the values of the symbols.
But, assuming the symbols mean what they usually mean, subtract ten from 15 to get 5, and subtract ten from 17 to get 7. (This works in any base, so long as it’s the same base for both numbers.) You get the remaining addition problem 5+6=7, which has the same meaning in all bases as it does in base 10, because these are single digits being added, and getting produced, so the base doesn’t matter.
Except that anything less than Base-7 does not recognize the character "6", and anything less than Base-6 does not recognize the character "5".