8-7=13+2r

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Solution for 8-7=13+2r equation: 



8-7=13+2r

We move all terms to the left:

8-7-(13+2r)=0

We add all the numbers together, and all the variables

-(2r+13)+8-7=0

We add all the numbers together, and all the variables

-(2r+13)+1=0

We get rid of parentheses

-2r-13+1=0

We add all the numbers together, and all the variables

-2r-12=0

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

-2r=12

r=12/-2

r=-6

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