0.54*2*3.1415*r+r=20.5

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Solution for 0.54*2*3.1415*r+r=20.5 equation: 



0.54*2*3.1415r+r=20.5

We move all terms to the left:

0.54*2*3.1415r+r-(20.5)=0

We add all the numbers together, and all the variables

r+0.54*2*3.1415r-20.5=0

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

r+0.54*2*3.1415r=20.5

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