21=44-2r

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Solution for 21=44-2r equation: 



21=44-2r

We move all terms to the left:

21-(44-2r)=0

We add all the numbers together, and all the variables

-(-2r+44)+21=0

We get rid of parentheses

2r-44+21=0

We add all the numbers together, and all the variables

2r-23=0

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

2r=23

r=23/2

r=11+1/2

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