20=2(r+27)

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Solution for 20=2(r+27) equation: 



20=2(r+27)

We move all terms to the left:

20-(2(r+27))=0



We calculate terms in parentheses: -(2(r+27)), so:

2(r+27)

We multiply parentheses

2r+54

Back to the equation:

-(2r+54)



We get rid of parentheses

-2r-54+20=0

We add all the numbers together, and all the variables

-2r-34=0

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

-2r=34

r=34/-2

r=-17

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