I3r-6I=21

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Solution for I3r-6I=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-27=0

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

3I=27

I=27/3

I=9

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