I-9=-7u+7

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Solution for I-9=-7u+7 equation: 



-9=-7I+7

We move all terms to the left:

-9-(-7I+7)=0

We get rid of parentheses

7I-7-9=0

We add all the numbers together, and all the variables

7I-16=0

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

7I=16

I=16/7

I=2+2/7

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