8=(r-4)

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Solution for 8=(r-4) equation: 



8=(r-4)

We move all terms to the left:

8-((r-4))=0



We calculate terms in parentheses: -((r-4)), so:

(r-4)

We get rid of parentheses

r-4

Back to the equation:

-(r-4)



We get rid of parentheses

-r+4+8=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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