2r+7r-7=20

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Solution for 2r+7r-7=20 equation: 



2r+7r-7=20

We move all terms to the left:

2r+7r-7-(20)=0

We add all the numbers together, and all the variables

9r-27=0

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

9r=27

r=27/9

r=3

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