47.1=2*3.14r

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Solution for 47.1=2*3.14r equation: 


Simplifying
47.1 = 2 * 3.14r

Multiply 2 * 3.14
47.1 = 6.28r

Solving
47.1 = 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.
47.1 + -6.28r = 6.28r + -6.28r

Combine like terms: 6.28r + -6.28r = 0.00
47.1 + -6.28r = 0.00

Add '-47.1' to each side of the equation.
47.1 + -47.1 + -6.28r = 0.00 + -47.1

Combine like terms: 47.1 + -47.1 = 0.0
0.0 + -6.28r = 0.00 + -47.1
-6.28r = 0.00 + -47.1

Combine like terms: 0.00 + -47.1 = -47.1
-6.28r = -47.1

Divide each side by '-6.28'.
r = 7.5

Simplifying
r = 7.5

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