27=31-r

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Solution for 27=31-r equation: 



27=31-r

We move all terms to the left:

27-(31-r)=0

We add all the numbers together, and all the variables

-(-1r+31)+27=0

We get rid of parentheses

1r-31+27=0

We add all the numbers together, and all the variables

r-4=0

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

r=4

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