-81=4r+19

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Solution for -81=4r+19 equation: 



-81=4r+19

We move all terms to the left:

-81-(4r+19)=0

We get rid of parentheses

-4r-19-81=0

We add all the numbers together, and all the variables

-4r-100=0

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

-4r=100

r=100/-4

r=-25

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