r+(r+2)=20

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Solution for r+(r+2)=20 equation: 



r+(r+2)=20

We move all terms to the left:

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

We get rid of parentheses

r+r+2-20=0

We add all the numbers together, and all the variables

2r-18=0

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

2r=18

r=18/2

r=9

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