7r+7=84

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Solution for 7r+7=84 equation: 



7r+7=84

We move all terms to the left:

7r+7-(84)=0

We add all the numbers together, and all the variables

7r-77=0

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

7r=77

r=77/7

r=11

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