7r+7=-21

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Solution for 7r+7=-21 equation: 



7r+7=-21

We move all terms to the left:

7r+7-(-21)=0

We add all the numbers together, and all the variables

7r+28=0

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

7r=-28

r=-28/7

r=-4

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