r-4=-12+2r

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Solution for r-4=-12+2r equation: 



r-4=-12+2r

We move all terms to the left:

r-4-(-12+2r)=0

We add all the numbers together, and all the variables

r-(2r-12)-4=0

We get rid of parentheses

r-2r+12-4=0

We add all the numbers together, and all the variables

-1r+8=0

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

-r=-8

r=-8/-1

r=+8

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