r+20/4=9

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Solution for r+20/4=9 equation: 



r+20/4=9

We move all terms to the left:

r+20/4-(9)=0

determiningTheFunctionDomain
r-9+20/4=0

We add all the numbers together, and all the variables

r-4=0

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

r=4

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