57=r+19

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Solution for 57=r+19 equation: 



57=r+19

We move all terms to the left:

57-(r+19)=0

We get rid of parentheses

-r-19+57=0

We add all the numbers together, and all the variables

-1r+38=0

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

-r=-38

r=-38/-1

r=+38

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