9(i-3)=81

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Solution for 9(i-3)=81 equation: 



9(i-3)=81

We move all terms to the left:

9(i-3)-(81)=0

We multiply parentheses

9i-27-81=0

We add all the numbers together, and all the variables

9i-108=0

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

9i=108

i=108/9

i=12

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