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2i+7=5i+4
We move all terms to the left:
2i+7-(5i+4)=0
We get rid of parentheses
2i-5i-4+7=0
We add all the numbers together, and all the variables
-3i+3=0
We move all terms containing i to the left, all other terms to the right
-3i=-3
i=-3/-3
i=1
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