9r+7=27-r

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Solution for 9r+7=27-r equation: 



9r+7=27-r

We move all terms to the left:

9r+7-(27-r)=0

We add all the numbers together, and all the variables

9r-(-1r+27)+7=0

We get rid of parentheses

9r+1r-27+7=0

We add all the numbers together, and all the variables

10r-20=0

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

10r=20

r=20/10

r=2

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