Guys, please. I genuinely need help! If you don't know- don't answer. And please don't look it up on g00gle, those type of answers are always unrelated to the topic. I need this question answered and an explanation.
I will give brainliest to whoever answered correctly, plus a thanks and a five-star rating.

I want to say Substitution.

Explanation:

They removed the number 5, and inserted an A, which makes me believe its substitution.

At first, I thought it was Insertion when they added the A, but i had to look back again and see that the 5 was removed.

Can't be duplication, since no number/letter was duplicated.

And it can't be Deletion, since another thing was inserted,

I hope this helps!!

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