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this post was submitted on 31 May 2025
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It never does
No you didn't. You showed you didn't understand the rules. Doing addition first for 10-1+1 is 10+1-1, not 10-(1+1). It literally means add all positive numbers together first, which are +10 and +1, as per Maths textbooks...
Note in the above simplification of the coefficients we have 6-11+5-7+2=6+5+2-11-7=13-18=-5, and not, as you claim 6-(11+5)-(7+2)=6-16-9=-19
It's a convention, not a rule, and as such can be completely ignored by those who understand the rules. See literal textbook example