20=r+12

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Solution for 20=r+12 equation: 



20=r+12

We move all terms to the left:

20-(r+12)=0

We get rid of parentheses

-r-12+20=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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