2(r-10)-r=r-20

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Solution for 2(r-10)-r=r-20 equation: 



2(r-10)-r=r-20

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1r+2(r-10)-(r-20)=0

We multiply parentheses

-1r+2r-(r-20)-20=0

We get rid of parentheses

-1r+2r-r+20-20=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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