Pls answer fast I am not getting it

Dear Student.

The solution/s to your 1st query has been provided below:

Given expression: +9-8-7+6-5-4+3+2+1Replacing + with - and - with +-9+8+7-6+5+4-3-2-1Grouping the positive terms together and the negetave terms together+8+7+5+4-9-6-3-2-124-21The required answer is 3

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Regards. 
 

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