Answer
$[ 1$ $3 ]$
$[ 1$ $5 ]$
(from left to right, 1, 3, 1, 5)
Work Step by Step
Because they are the same size, they can be added.
$2+-1=1, 6+-3=3$
$-5+6=1, 3+2=5$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.