20=11+3r

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Solution for 20=11+3r equation: 



20=11+3r

We move all terms to the left:

20-(11+3r)=0

We add all the numbers together, and all the variables

-(3r+11)+20=0

We get rid of parentheses

-3r-11+20=0

We add all the numbers together, and all the variables

-3r+9=0

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

-3r=-9

r=-9/-3

r=+3

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