9r+7=3r+31

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Solution for 9r+7=3r+31 equation: 



9r+7=3r+31

We move all terms to the left:

9r+7-(3r+31)=0

We get rid of parentheses

9r-3r-31+7=0

We add all the numbers together, and all the variables

6r-24=0

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

6r=24

r=24/6

r=4

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