7-8r=-7r

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



7-8r=-7r

We move all terms to the left:

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

We get rid of parentheses

-8r+7r+7=0

We add all the numbers together, and all the variables

-1r+7=0

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

-r=-7

r=-7/-1

r=+7

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