2(3.14)r=4

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Solution for 2(3.14)r=4 equation: 



2(3.14)r=4

We move all terms to the left:

2(3.14)r-(4)=0

We multiply parentheses

6.28r-4=0

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

6.28r=4

r=4/6.28

r=2/3.14

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