7r-7=77

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Solution for 7r-7=77 equation: 



7r-7=77

We move all terms to the left:

7r-7-(77)=0

We add all the numbers together, and all the variables

7r-84=0

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

7r=84

r=84/7

r=12

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