7r-7r+3r-r+2r=12

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Solution for 7r-7r+3r-r+2r=12 equation: 



7r-7r+3r-r+2r=12

We move all terms to the left:

7r-7r+3r-r+2r-(12)=0

We add all the numbers together, and all the variables

4r-12=0

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

4r=12

r=12/4

r=3

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