4r-r=12

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Solution for 4r-r=12 equation: 



4r-r=12

We move all terms to the left:

4r-r-(12)=0

We add all the numbers together, and all the variables

3r-12=0

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

3r=12

r=12/3

r=4

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