4i-7=21

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Solution for 4i-7=21 equation: 



4i-7=21

We move all terms to the left:

4i-7-(21)=0

We add all the numbers together, and all the variables

4i-28=0

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

4i=28

i=28/4

i=7

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