12=-4+2r

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Solution for 12=-4+2r equation: 



12=-4+2r

We move all terms to the left:

12-(-4+2r)=0

We add all the numbers together, and all the variables

-(2r-4)+12=0

We get rid of parentheses

-2r+4+12=0

We add all the numbers together, and all the variables

-2r+16=0

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

-2r=-16

r=-16/-2

r=+8

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