r+(-15)=12

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Solution for r+(-15)=12 equation: 



r+(-15)=12

We move all terms to the left:

r+(-15)-(12)=0

determiningTheFunctionDomain
r-12+(-15)=0

We add all the numbers together, and all the variables

r-27=0

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

r=27

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