80=r-30

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Solution for 80=r-30 equation: 



80=r-30

We move all terms to the left:

80-(r-30)=0

We get rid of parentheses

-r+30+80=0

We add all the numbers together, and all the variables

-1r+110=0

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

-r=-110

r=-110/-1

r=+110

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