r=2*3.14*r

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Solution for r=2*3.14*r equation: 


Simplifying
r = 2 * 3.14r

Multiply 2 * 3.14
r = 6.28r

Solving
r = 6.28r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-6.28r' to each side of the equation.
r + -6.28r = 6.28r + -6.28r

Combine like terms: r + -6.28r = -5.28r
-5.28r = 6.28r + -6.28r

Combine like terms: 6.28r + -6.28r = 0.00
-5.28r = 0.00

Divide each side by '-5.28'.
r = 0

Simplifying
r = 0

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