this post was submitted on 27 Nov 2025
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If you have a bunch of unparenthesized addition and subtraction, left to right doesn't matter.
1 + 2 - 3 = 1 - 3 + 2 = -3 + 2 + 1
True, but as with many things, something has to be the rule for processing it. For many teachers as I've heard, order of appearance is 'the rule' when commutative properties apply. ... at least until algebra demands simplification, but that's a different topic.