3i+6=21

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Solution for 3i+6=21 equation: 



3i+6=21

We move all terms to the left:

3i+6-(21)=0

We add all the numbers together, and all the variables

3i-15=0

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

3i=15

i=15/3

i=5

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