80=r-3

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Solution for 80=r-3 equation: 



80=r-3

We move all terms to the left:

80-(r-3)=0

We get rid of parentheses

-r+3+80=0

We add all the numbers together, and all the variables

-1r+83=0

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

-r=-83

r=-83/-1

r=+83

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