I=x-9

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Solution for I=x-9 equation: 



=I-9

We move all terms to the left:

-(I-9)=0

We get rid of parentheses

-I+9=0

We add all the numbers together, and all the variables

-1I+9=0

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

-I=-9

I=-9/-1

I=+9

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