9r+9=12r

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Solution for 9r+9=12r equation: 



9r+9=12r

We move all terms to the left:

9r+9-(12r)=0

We add all the numbers together, and all the variables

-3r+9=0

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

-3r=-9

r=-9/-3

r=+3

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