15=2*3.14159r

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Solution for 15=2*3.14159r equation: 



15=2*3.14159r

We move all terms to the left:

15-(2*3.14159r)=0

We add all the numbers together, and all the variables

-(+2*3.14159r)+15=0

We get rid of parentheses

-2*3.14159r+15=0

Wy multiply elements

-6r+15=0

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

-6r=-15

r=-15/-6

r=2+1/2

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