12r-9=8r+31

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Solution for 12r-9=8r+31 equation: 



12r-9=8r+31

We move all terms to the left:

12r-9-(8r+31)=0

We get rid of parentheses

12r-8r-31-9=0

We add all the numbers together, and all the variables

4r-40=0

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

4r=40

r=40/4

r=10

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