-1=r+7-1

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Solution for -1=r+7-1 equation: 



-1=r+7-1

We move all terms to the left:

-1-(r+7-1)=0

We add all the numbers together, and all the variables

-(r+6)-1=0

We get rid of parentheses

-r-6-1=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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