20=r+1

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Solution for 20=r+1 equation: 



20=r+1

We move all terms to the left:

20-(r+1)=0

We get rid of parentheses

-r-1+20=0

We add all the numbers together, and all the variables

-1r+19=0

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

-r=-19

r=-19/-1

r=+19

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