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13-3.5i=4-8i
We move all terms to the left:
13-3.5i-(4-8i)=0
We add all the numbers together, and all the variables
-3.5i-(-8i+4)+13=0
We get rid of parentheses
-3.5i+8i-4+13=0
We add all the numbers together, and all the variables
4.5i+9=0
We move all terms containing i to the left, all other terms to the right
4.5i=-9
i=-9/4.5
i=-2
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