80=20+5r

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Solution for 80=20+5r equation: 



80=20+5r

We move all terms to the left:

80-(20+5r)=0

We add all the numbers together, and all the variables

-(5r+20)+80=0

We get rid of parentheses

-5r-20+80=0

We add all the numbers together, and all the variables

-5r+60=0

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

-5r=-60

r=-60/-5

r=+12

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