57=30+r

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Solution for 57=30+r equation: 



57=30+r

We move all terms to the left:

57-(30+r)=0

We add all the numbers together, and all the variables

-(r+30)+57=0

We get rid of parentheses

-r-30+57=0

We add all the numbers together, and all the variables

-1r+27=0

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

-r=-27

r=-27/-1

r=+27

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