r+20/2=20

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Solution for r+20/2=20 equation: 



r+20/2=20

We move all terms to the left:

r+20/2-(20)=0

determiningTheFunctionDomain
r-20+20/2=0

We add all the numbers together, and all the variables

r-10=0

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

r=10

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