7-7r+7=-7

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Solution for 7-7r+7=-7 equation: 



7-7r+7=-7

We move all terms to the left:

7-7r+7-(-7)=0

We add all the numbers together, and all the variables

-7r+21=0

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

-7r=-21

r=-21/-7

r=+3

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