r+9+7r=12+8r-3

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Solution for r+9+7r=12+8r-3 equation: 



r+9+7r=12+8r-3

We move all terms to the left:

r+9+7r-(12+8r-3)=0

We add all the numbers together, and all the variables

r+7r-(8r+9)+9=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

8r-8r-9+9=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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