Answer
Subtracting a number is the same as adding the opposite number.
Work Step by Step
For instance:
$3-3=0$
but
$3+(-3)=3-3=0$
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.