9=30-7r

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Solution for 9=30-7r equation: 



9=30-7r

We move all terms to the left:

9-(30-7r)=0

We add all the numbers together, and all the variables

-(-7r+30)+9=0

We get rid of parentheses

7r-30+9=0

We add all the numbers together, and all the variables

7r-21=0

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

7r=21

r=21/7

r=3

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