15=2*3.14r

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Solution for 15=2*3.14r equation:


Simplifying
15 = 2 * 3.14r

Multiply 2 * 3.14
15 = 6.28r

Solving
15 = 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.
15 + -6.28r = 6.28r + -6.28r

Combine like terms: 6.28r + -6.28r = 0.00
15 + -6.28r = 0.00

Add '-15' to each side of the equation.
15 + -15 + -6.28r = 0.00 + -15

Combine like terms: 15 + -15 = 0
0 + -6.28r = 0.00 + -15
-6.28r = 0.00 + -15

Combine like terms: 0.00 + -15 = -15
-6.28r = -15

Divide each side by '-6.28'.
r = 2.388535032

Simplifying
r = 2.388535032

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