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Move one match: XI = III + III

A matchstick Roman-numeral equation with one legal move. From the free puzzle set on Think Fanny — next try Three switches, one bulb.

Think Fanny visual matchstick puzzle close-up

The puzzle

You have this Roman-numeral matchstick equation:

XI = III + III

Move exactly one matchstick so the equation becomes true. You may not change the operators into words or add matches from outside the puzzle.