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2I-7=7-2I
We move all terms to the left:
2I-7-(7-2I)=0
We add all the numbers together, and all the variables
2I-(-2I+7)-7=0
We get rid of parentheses
2I+2I-7-7=0
We add all the numbers together, and all the variables
4I-14=0
We move all terms containing I to the left, all other terms to the right
4I=14
I=14/4
I=3+1/2
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