4=(r+-8)

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Solution for 4=(r+-8) equation: 



4=(r+-8)

We move all terms to the left:

4-((r+-8))=0

We add all the numbers together, and all the variables

-((r-8))+4=0



We calculate terms in parentheses: -((r-8)), so:

(r-8)

We get rid of parentheses

r-8

Back to the equation:

-(r-8)



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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