r-(-7)=20

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Solution for r-(-7)=20 equation: 



r-(-7)=20

We move all terms to the left:

r-(-7)-(20)=0

determiningTheFunctionDomain
r-20-(-7)=0

We add all the numbers together, and all the variables

r-13=0

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

r=13

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