2r=-r-7r

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Solution for 2r=-r-7r equation: 



2r=-r-7r

We move all terms to the left:

2r-(-r-7r)=0

We add all the numbers together, and all the variables

2r-(-8r)=0

We get rid of parentheses

2r+8r=0

We add all the numbers together, and all the variables

10r=0

r=0/10

r=0

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