23=21-r=

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Solution for 23=21-r= equation: 



23=21-r=

We move all terms to the left:

23-(21-r)=0

We add all the numbers together, and all the variables

-(-1r+21)+23=0

We get rid of parentheses

1r-21+23=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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