A Universal Solution

In 1965, Dmitri Borgmann noted that this expression:

11 + 2 - 1 = 12

… is valid also when interpreted as a set of characters:

11 "+ 2″ = 112; 112 "- 1″ = 12

… as a set of Roman numerals:

XI + II = XIII; XIII - I = XII

… and even as a set of letters:

ELEVEN + TWO = ELEVENTWO
ELEVENTWO - ONE = LEVETW (= TWELVE)

.....I thought that was pretty cool....