r-r+3r+3r=12

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Solution for r-r+3r+3r=12 equation: 



r-r+3r+3r=12

We move all terms to the left:

r-r+3r+3r-(12)=0

We add all the numbers together, and all the variables

6r-12=0

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

6r=12

r=12/6

r=2

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