22=20-r

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Solution for 22=20-r equation: 



22=20-r

We move all terms to the left:

22-(20-r)=0

We add all the numbers together, and all the variables

-(-1r+20)+22=0

We get rid of parentheses

1r-20+22=0

We add all the numbers together, and all the variables

r+2=0

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

r=-2

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