I=81-8u

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Solution for I=81-8u equation: 



=81-8I

We move all terms to the left:

-(81-8I)=0

We add all the numbers together, and all the variables

-(-8I+81)=0

We get rid of parentheses

8I-81=0

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

8I=81

I=81/8

I=10+1/8

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