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3i-7=7i+13
We move all terms to the left:
3i-7-(7i+13)=0
We get rid of parentheses
3i-7i-13-7=0
We add all the numbers together, and all the variables
-4i-20=0
We move all terms containing i to the left, all other terms to the right
-4i=20
i=20/-4
i=-5
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