12=6-r

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Solution for 12=6-r equation: 



12=6-r

We move all terms to the left:

12-(6-r)=0

We add all the numbers together, and all the variables

-(-1r+6)+12=0

We get rid of parentheses

1r-6+12=0

We add all the numbers together, and all the variables

r+6=0

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

r=-6

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