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-3i=-10-2
We move all terms to the left:
-3i-(-10-2)=0
We add all the numbers together, and all the variables
-3i-(-12)=0
We add all the numbers together, and all the variables
-3i+12=0
We move all terms containing i to the left, all other terms to the right
-3i=-12
i=-12/-3
i=+4
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