7-8r=13-7r

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Solution for 7-8r=13-7r equation: 



7-8r=13-7r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

-1r-6=0

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

-r=6

r=6/-1

r=-6

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