8=-7+r

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Solution for 8=-7+r equation: 



8=-7+r

We move all terms to the left:

8-(-7+r)=0

We add all the numbers together, and all the variables

-(r-7)+8=0

We get rid of parentheses

-r+7+8=0

We add all the numbers together, and all the variables

-1r+15=0

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

-r=-15

r=-15/-1

r=+15

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