8r-3.9r=20.5

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Solution for 8r-3.9r=20.5 equation: 



8r-3.9r=20.5

We move all terms to the left:

8r-3.9r-(20.5)=0

We add all the numbers together, and all the variables

4.1r-20.5=0

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

4.1r=20.5

r=20.5/4.1

r=5

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