21+7r=-21

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Solution for 21+7r=-21 equation: 



21+7r=-21

We move all terms to the left:

21+7r-(-21)=0

We add all the numbers together, and all the variables

7r+42=0

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

7r=-42

r=-42/7

r=-6

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