r=10+2r

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Solution for r=10+2r equation: 



r=10+2r

We move all terms to the left:

r-(10+2r)=0

We add all the numbers together, and all the variables

r-(2r+10)=0

We get rid of parentheses

r-2r-10=0

We add all the numbers together, and all the variables

-1r-10=0

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

-r=10

r=10/-1

r=-10

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