2r-21+7r-6=108

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Solution for 2r-21+7r-6=108 equation: 



2r-21+7r-6=108

We move all terms to the left:

2r-21+7r-6-(108)=0

We add all the numbers together, and all the variables

9r-135=0

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

9r=135

r=135/9

r=15

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