r+15+21+6=55.5

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Solution for r+15+21+6=55.5 equation: 



r+15+21+6=55.5

We move all terms to the left:

r+15+21+6-(55.5)=0

We add all the numbers together, and all the variables

r-13.5=0

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

r=13.5

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