4=20-4r

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Solution for 4=20-4r equation: 



4=20-4r

We move all terms to the left:

4-(20-4r)=0

We add all the numbers together, and all the variables

-(-4r+20)+4=0

We get rid of parentheses

4r-20+4=0

We add all the numbers together, and all the variables

4r-16=0

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

4r=16

r=16/4

r=4

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