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What's the answer to this?

2 x 3

Easy!

2 x 3 = 6

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

3 x 2

Same thing, huh?

3 x 2 = 6

Well, if both things equal 6...

2 x 3 = 6 = 3 x 2

Then those things have to equal each other!

2 x 3 = 3 x 2