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229=120-i
We move all terms to the left:
229-(120-i)=0
We add all the numbers together, and all the variables
-(-1i+120)+229=0
We get rid of parentheses
1i-120+229=0
We add all the numbers together, and all the variables
i+109=0
We move all terms containing i to the left, all other terms to the right
i=-109
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