6r-7r+7=13+7r-7r

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Solution for 6r-7r+7=13+7r-7r equation: 



6r-7r+7=13+7r-7r

We move all terms to the left:

6r-7r+7-(13+7r-7r)=0

We add all the numbers together, and all the variables

6r-7r+7-13=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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