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Math synchronous exercises in the first grade of primary school, page 46, 3 questions.
These are two addends on both sides of the equal sign, and you will learn later: additive commutative law, it's very simple!

( 10)+2=(2)+ 10

That is, move the left 10 to the right of the plus sign, and then 2 jumps to the original space 10, which becomes the right of the equal sign.