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What is the reason for statement 1 in the proof -c+(c+a)=a?

What is the reason for statement 1 in the proof -c+(c+a)=a?-example-1

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Commutative property of addition. It basically means that (a + b) + c is the same as a + (b + c), because when it comes to addition, the order of the numbers doesnt matter. 2+3 is the same as 3+2, right?


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