12r+7=55

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Solution for 12r+7=55 equation: 



12r+7=55

We move all terms to the left:

12r+7-(55)=0

We add all the numbers together, and all the variables

12r-48=0

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

12r=48

r=48/12

r=4

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