80=8(8+2r)

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Solution for 80=8(8+2r) equation: 



80=8(8+2r)

We move all terms to the left:

80-(8(8+2r))=0

We add all the numbers together, and all the variables

-(8(2r+8))+80=0



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

8(2r+8)

We multiply parentheses

16r+64

Back to the equation:

-(16r+64)



We get rid of parentheses

-16r-64+80=0

We add all the numbers together, and all the variables

-16r+16=0

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

-16r=-16

r=-16/-16

r=1

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