r=20-19r

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Solution for r=20-19r equation: 



r=20-19r

We move all terms to the left:

r-(20-19r)=0

We add all the numbers together, and all the variables

r-(-19r+20)=0

We get rid of parentheses

r+19r-20=0

We add all the numbers together, and all the variables

20r-20=0

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

20r=20

r=20/20

r=1

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