20=20-8r-10r

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Solution for 20=20-8r-10r equation: 



20=20-8r-10r

We move all terms to the left:

20-(20-8r-10r)=0

We add all the numbers together, and all the variables

-(-18r+20)+20=0

We get rid of parentheses

18r-20+20=0

We add all the numbers together, and all the variables

18r=0

r=0/18

r=0

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