28=3r+7

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Solution for 28=3r+7 equation: 



28=3r+7

We move all terms to the left:

28-(3r+7)=0

We get rid of parentheses

-3r-7+28=0

We add all the numbers together, and all the variables

-3r+21=0

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

-3r=-21

r=-21/-3

r=+7

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