12=27-r

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Solution for 12=27-r equation: 



12=27-r

We move all terms to the left:

12-(27-r)=0

We add all the numbers together, and all the variables

-(-1r+27)+12=0

We get rid of parentheses

1r-27+12=0

We add all the numbers together, and all the variables

r-15=0

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

r=15

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