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2I+1=-I
We move all terms to the left:
2I+1-(-I)=0
We add all the numbers together, and all the variables
2I-(-1I)+1=0
We get rid of parentheses
2I+1I+1=0
We add all the numbers together, and all the variables
3I+1=0
We move all terms containing I to the left, all other terms to the right
3I=-1
I=-1/3
I=-1/3
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