12=8+2r

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Solution for 12=8+2r equation: 



12=8+2r

We move all terms to the left:

12-(8+2r)=0

We add all the numbers together, and all the variables

-(2r+8)+12=0

We get rid of parentheses

-2r-8+12=0

We add all the numbers together, and all the variables

-2r+4=0

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

-2r=-4

r=-4/-2

r=+2

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