7r=42+r

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Solution for 7r=42+r equation: 



7r=42+r

We move all terms to the left:

7r-(42+r)=0

We add all the numbers together, and all the variables

7r-(r+42)=0

We get rid of parentheses

7r-r-42=0

We add all the numbers together, and all the variables

6r-42=0

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

6r=42

r=42/6

r=7

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