I5=30-r

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Solution for I5=30-r equation: 



5=30-I

We move all terms to the left:

5-(30-I)=0

We add all the numbers together, and all the variables

-(-1I+30)+5=0

We get rid of parentheses

1I-30+5=0

We add all the numbers together, and all the variables

I-25=0

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

I=25

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