20=4r-12

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Solution for 20=4r-12 equation: 



20=4r-12

We move all terms to the left:

20-(4r-12)=0

We get rid of parentheses

-4r+12+20=0

We add all the numbers together, and all the variables

-4r+32=0

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

-4r=-32

r=-32/-4

r=+8

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