3r+r=12

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Solution for 3r+r=12 equation: 



3r+r=12

We move all terms to the left:

3r+r-(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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