21.64=8(r+2)

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Solution for 21.64=8(r+2) equation: 



21.64=8(r+2)

We move all terms to the left:

21.64-(8(r+2))=0



We calculate terms in parentheses: -(8(r+2)), so:

8(r+2)

We multiply parentheses

8r+16

Back to the equation:

-(8r+16)



We get rid of parentheses

-8r-16+21.64=0

We add all the numbers together, and all the variables

-8r+5.64=0

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

-8r=-5.64

r=-5.64/-8

r=3.43902439024/4.87804878049

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