4i+9=21

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Solution for 4i+9=21 equation: 



4i+9=21

We move all terms to the left:

4i+9-(21)=0

We add all the numbers together, and all the variables

4i-12=0

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

4i=12

i=12/4

i=3

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