11=20+r

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Solution for 11=20+r equation: 



11=20+r

We move all terms to the left:

11-(20+r)=0

We add all the numbers together, and all the variables

-(r+20)+11=0

We get rid of parentheses

-r-20+11=0

We add all the numbers together, and all the variables

-1r-9=0

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

-r=9

r=9/-1

r=-9

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