12r-6=138

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Solution for 12r-6=138 equation: 



12r-6=138

We move all terms to the left:

12r-6-(138)=0

We add all the numbers together, and all the variables

12r-144=0

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

12r=144

r=144/12

r=12

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