12r-7=8r+21

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Solution for 12r-7=8r+21 equation: 



12r-7=8r+21

We move all terms to the left:

12r-7-(8r+21)=0

We get rid of parentheses

12r-8r-21-7=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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