20=8r-4

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Solution for 20=8r-4 equation: 



20=8r-4

We move all terms to the left:

20-(8r-4)=0

We get rid of parentheses

-8r+4+20=0

We add all the numbers together, and all the variables

-8r+24=0

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

-8r=-24

r=-24/-8

r=+3

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