12r-4r+1=9

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Solution for 12r-4r+1=9 equation: 



12r-4r+1=9

We move all terms to the left:

12r-4r+1-(9)=0

We add all the numbers together, and all the variables

8r-8=0

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

8r=8

r=8/8

r=1

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