7r-r-3r-r=12

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



7r-r-3r-r=12

We move all terms to the left:

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

We add all the numbers together, and all the variables

2r-12=0

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

2r=12

r=12/2

r=6

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