7=13-8r

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Solution for 7=13-8r equation: 



7=13-8r

We move all terms to the left:

7-(13-8r)=0

We add all the numbers together, and all the variables

-(-8r+13)+7=0

We get rid of parentheses

8r-13+7=0

We add all the numbers together, and all the variables

8r-6=0

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

8r=6

r=6/8

r=3/4

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