80=10(r+3)

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Solution for 80=10(r+3) equation: 



80=10(r+3)

We move all terms to the left:

80-(10(r+3))=0



We calculate terms in parentheses: -(10(r+3)), so:

10(r+3)

We multiply parentheses

10r+30

Back to the equation:

-(10r+30)



We get rid of parentheses

-10r-30+80=0

We add all the numbers together, and all the variables

-10r+50=0

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

-10r=-50

r=-50/-10

r=+5

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