19=21-2r

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Solution for 19=21-2r equation: 



19=21-2r

We move all terms to the left:

19-(21-2r)=0

We add all the numbers together, and all the variables

-(-2r+21)+19=0

We get rid of parentheses

2r-21+19=0

We add all the numbers together, and all the variables

2r-2=0

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

2r=2

r=2/2

r=1

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