Question

What must be added to − + to get the sum of − + − + and + − ​

Answer 1

Answer:

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's metabolic activities. Wikipedia

Answer 2

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U should give a perfect question its incomplete..

When dealing with addition and subtraction that incorporates negative numbers, I have found it is helpful in situations like this to consider a "tipping point" between positive and negative numbers which is right at ZERO.