7r=8-r-r

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Solution for 7r=8-r-r equation: 



7r=8-r-r

We move all terms to the left:

7r-(8-r-r)=0

We add all the numbers together, and all the variables

7r-(-2r+8)=0

We get rid of parentheses

7r+2r-8=0

We add all the numbers together, and all the variables

9r-8=0

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

9r=8

r=8/9

r=8/9

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