9r-21=5r+7

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Solution for 9r-21=5r+7 equation: 



9r-21=5r+7

We move all terms to the left:

9r-21-(5r+7)=0

We get rid of parentheses

9r-5r-7-21=0

We add all the numbers together, and all the variables

4r-28=0

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

4r=28

r=28/4

r=7

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