2*3.14*r=40

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Solution for 2*3.14*r=40 equation: 



2*3.14r=40

We move all terms to the left:

2*3.14r-(40)=0

Wy multiply elements

6r-40=0

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

6r=40

r=40/6

r=6+2/3

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