21-3i=12

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Solution for 21-3i=12 equation: 



21-3i=12

We move all terms to the left:

21-3i-(12)=0

We add all the numbers together, and all the variables

-3i+9=0

We move all terms containing i to the left, all other terms to the right

-3i=-9

i=-9/-3

i=+3

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