r+20/2=1

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Solution for r+20/2=1 equation: 



r+20/2=1

We move all terms to the left:

r+20/2-(1)=0

determiningTheFunctionDomain
r-1+20/2=0

We add all the numbers together, and all the variables

r+9=0

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

r=-9

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