-20=4r-8

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Solution for -20=4r-8 equation: 



-20=4r-8

We move all terms to the left:

-20-(4r-8)=0

We get rid of parentheses

-4r+8-20=0

We add all the numbers together, and all the variables

-4r-12=0

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

-4r=12

r=12/-4

r=-3

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