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What's the answer to this?

2 + 3

Yeah, that's an easy one!

2 + 3 = 5

How about switching the order...  What do we get then?

3 + 2

Same thing, huh?

3 + 2 = 5

Well, if both things equal 5...

2 + 3 = 5 = 3 + 2

Then those things have to equal each other!

2 + 3 = 3 + 2