2=12-r

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Solution for 2=12-r equation: 



2=12-r

We move all terms to the left:

2-(12-r)=0

We add all the numbers together, and all the variables

-(-1r+12)+2=0

We get rid of parentheses

1r-12+2=0

We add all the numbers together, and all the variables

r-10=0

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

r=10

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