4=-8+r

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Solution for 4=-8+r equation: 



4=-8+r

We move all terms to the left:

4-(-8+r)=0

We add all the numbers together, and all the variables

-(r-8)+4=0

We get rid of parentheses

-r+8+4=0

We add all the numbers together, and all the variables

-1r+12=0

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

-r=-12

r=-12/-1

r=+12

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