r-21.4=87.9

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Solution for r-21.4=87.9 equation: 



r-21.4=87.9

We move all terms to the left:

r-21.4-(87.9)=0

We add all the numbers together, and all the variables

r-109.3=0

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

r=109.3

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