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A fake Facebook event disguised as a math problem has been one of its top posts for 6 months
(www.engadget.com)
This is a most excellent place for technology news and articles.
It's so we don't have to spam brackets everywhere
9+2-1+6-4+7-3+5=
Becomes
((((((9+2)-1)+6)-4)+7)-3)+5=
That's just clutter for no good reason when we can just say if it doesn't have parentheses it's left to right. Having a default evaluation order makes sense and means we only need parentheses when we want to deviate from the norm.