8=r+20/4

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Solution for 8=r+20/4 equation: 



8=r+20/4

We move all terms to the left:

8-(r+20/4)=0

We add all the numbers together, and all the variables

-(r+5)+8=0

We get rid of parentheses

-r-5+8=0

We add all the numbers together, and all the variables

-1r+3=0

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

-r=-3

r=-3/-1

r=+3

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