21=2*3.14*r

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Solution for 21=2*3.14*r equation:


Simplifying
21 = 2 * 3.14r

Multiply 2 * 3.14
21 = 6.28r

Solving
21 = 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.
21 + -6.28r = 6.28r + -6.28r

Combine like terms: 6.28r + -6.28r = 0.00
21 + -6.28r = 0.00

Add '-21' to each side of the equation.
21 + -21 + -6.28r = 0.00 + -21

Combine like terms: 21 + -21 = 0
0 + -6.28r = 0.00 + -21
-6.28r = 0.00 + -21

Combine like terms: 0.00 + -21 = -21
-6.28r = -21

Divide each side by '-6.28'.
r = 3.343949045

Simplifying
r = 3.343949045

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