r-7.8=13.1

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Solution for r-7.8=13.1 equation: 



r-7.8=13.1

We move all terms to the left:

r-7.8-(13.1)=0

We add all the numbers together, and all the variables

r-20.9=0

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

r=20.9

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